Illinois subpoena rules let attorneys and court clerks issue subpoenas without a judge’s approval, require proper personal or certified-mail service with witness fees tendered, allow recipients to move to quash or modify on grounds like privilege or overbreadth, and back everything up with contempt sanctions and, in some cases, a body attachment order. The rules sit mostly in 735 ILCS 5, the Illinois Supreme Court Rules on discovery, and a handful of privilege statutes. What follows walks through who can issue one, what it can demand, how it must be served, and what your options are when one lands on you.
Who Can Issue a Subpoena
Under 735 ILCS 5/2-1101, two people can put a civil subpoena in your hands. The clerk of the court where the case is pending must issue one on request from either party, for witnesses anywhere in Illinois; a clerk who refuses can be fined up to $100. And any attorney admitted to practice in Illinois can issue subpoenas, including subpoenas duces tecum, as an officer of the court, without a court order.1FindLaw. Illinois Code 735 ILCS 5-2-1101 That second point catches many non-lawyers off guard: opposing counsel does not need a judge’s permission to make you a witness.
Criminal cases work the same way. Under 725 ILCS 5/115-17, the clerk issues subpoenas on behalf of either the prosecution or the defense, directed to the sheriff or coroner of any Illinois county.2Illinois General Assembly. Illinois Code 725 ILCS 5-115-17 Judges can issue subpoenas themselves when a party is unrepresented or the court otherwise needs to step in.
Types of Subpoenas You Might Receive
Illinois recognizes three main forms, and the label on the document tells you what it is asking for.
Subpoena Duces Tecum
This form compels production of documents, records, or tangible evidence. Illinois Supreme Court Rule 204(a)(1) lets these subpoenas command anything that “constitutes or contains evidence relating to any of the matters within the scope of the examination” allowed by the discovery rules.3Illinois Courts. Illinois Supreme Court Rule 204 The requesting party has to describe the documents specifically enough that you can identify what is being asked for; vague or open-ended requests are a common basis for challenges. When the subpoena duces tecum accompanies a deposition notice, a copy has to be filed with the court at least 14 days before the deposition.
Subpoena Ad Testificandum
This compels a person to appear and testify at trial, a hearing, or another court proceeding. Attorneys can issue these in civil and criminal cases without prior court approval. A witness who fails to appear risks contempt and, in some cases, a body attachment order sending law enforcement to bring them in.
Deposition Subpoena
A deposition subpoena compels sworn testimony before trial and is governed by Rule 204. The document has to specify the date, time, and location of the deposition and be properly served. Rule 204(a)(4) offers a document-only alternative: the deposition notice can excuse the witness’s personal appearance if copies of specified documents are delivered by a stated date, with the requesting party paying reasonable production charges.3Illinois Courts. Illinois Supreme Court Rule 204
How Service Has to Be Done
A subpoena is only enforceable when it is served correctly. Illinois generally requires personal service, meaning the document is physically handed to the recipient. A sheriff, a licensed private process server, or any person over 18 who is not a party to the case can do this.4Illinois State Bar Association. New Rule: Service of Process in Cook County
Deposition subpoenas can also be served by mail under Rule 204(a)(2), but the requirements are strict. The subpoena has to go by certified or registered mail, restricted delivery, return receipt requested, and must arrive at least seven days before the required appearance. A check or money order for the witness fee and mileage has to be enclosed. The return receipt plus an affidavit of the mailing details proves service.3Illinois Courts. Illinois Supreme Court Rule 204
Organizations are served through a registered agent or authorized representative. Defective service can invalidate the whole subpoena, so if you were never properly served, that alone can be a reason you are not obligated to appear.
Witness Fees and Mileage
Illinois pays every subpoenaed witness $20 per day of attendance and $0.20 per mile of travel each way. If a witness travels to a different county, each day of travel counts as a day of attendance. Deposition witnesses get the same per diem and mileage. A witness can only collect after filing an affidavit confirming the days actually attended and that the attendance was at the request of a party or attorney.5FindLaw. Illinois Code 705 – 35-4.3 Witness Fees
Rule 204(a)(2) makes tender of the witness fee and mileage a condition of compliance for deponents. If the issuing side never paid you, you have a valid basis for non-compliance.3Illinois Courts. Illinois Supreme Court Rule 204 Expert witnesses stand apart; they are not obligated to testify without appropriate compensation beyond the standard $20 per day, and the court can hold a hearing to set a reasonable expert fee.
What to Do When One Arrives
Treat the subpoena as a binding court order even though an attorney, not a judge, may have signed it. Read the whole document. Note what it demands: testimony, documents, or both. Check the deadline, the location, and any format instructions.
If testimony is required and you have a real scheduling conflict, call the issuing attorney and negotiate a new date. Get any agreed changes in writing. Courts have little patience for people who simply do not show up when a phone call could have solved it.
For document production, gather everything responsive but flag anything that might be privileged or protected. The Personal Information Protection Act (815 ILCS 530) imposes obligations on businesses handling personal data like Social Security numbers, financial account information, and biometric data.6Illinois General Assembly. Illinois Code 815 ILCS 530-10 Personal Information Protection Act Some records get even stronger protection.
Records You Do Not Have to Turn Over
A subpoena does not override privilege. Several categories of records are shielded, and knowing which apply to you can be the difference between compliance and a serious mistake.
Mental Health Records
The Mental Health and Developmental Disabilities Confidentiality Act (740 ILCS 110) is one of the strongest protections in Illinois law. A subpoena by itself is not enough. It has to be accompanied by either a written court order authorizing disclosure or the written consent of the person whose records are sought. Every subpoena for mental health records has to include a notice saying so. Before ordering disclosure, the court has to give written notice to the recipient and the treatment provider and give them a chance to be heard, and any party can request in camera review, where the judge examines the records privately before deciding.7Illinois General Assembly. Illinois Code 740 ILCS 110 – Mental Health and Developmental Disabilities Confidentiality Act
Physician-Patient Communications
Under 735 ILCS 5/8-802, a physician or surgeon generally cannot be compelled to disclose information acquired while treating a patient. The exceptions are narrow: homicide trials where the disclosure relates directly to the circumstances of the killing, malpractice actions against the physician, cases where the patient’s physical or mental condition is at issue, cases brought with the patient’s express consent, and grand jury subpoenas under the Code of Criminal Procedure.8Illinois General Assembly. Illinois Code 735 ILCS 5-8-802 If your medical records are subpoenaed and none of these fits, you have strong grounds to challenge production.
Reporter’s Sources
Under 735 ILCS 5/8-901, no court can compel a reporter to disclose the source of information except as specifically provided elsewhere in that part of the statute.9Illinois General Assembly. Illinois Code 735 ILCS 5-8-901
Attorney-Client Communications and Work Product
Attorney-client communications and attorney work product are also protected. Work product covers documents and materials prepared in anticipation of litigation and specifically shields an attorney’s mental impressions, conclusions, and legal theories. A party seeking work-product materials has to show a substantial need and an inability to obtain the equivalent information by other means without undue hardship. Drafts of expert reports are protected; the final expert report is discoverable.
Emails, Texts, and Other Electronic Records
Subpoenas increasingly target electronically stored information. Illinois Supreme Court Rule 214 governs ESI production between parties. If a request does not specify a format, the responding party has to produce ESI in the form it is ordinarily maintained or in a reasonably usable form.10Illinois Courts. Illinois Supreme Court Rule 214 The reasonably-usable option matters: it prevents a party from dumping thousands of unsearchable image files when the originals lived in a searchable database.
You can object to ESI requests when the burden or expense of production would be disproportionate to the likely benefit. Courts weigh proportionality under Rule 201(c)(3), looking at the amount in controversy, the parties’ resources, the importance of the issues, and the importance of the requested discovery to resolving them.11Illinois Courts. Illinois Supreme Court Rule 201 Most ESI fights are won or lost on proportionality. A request to image a whole company server for a $15,000 contract dispute rarely survives.
Filing a Motion to Quash or Modify
You are not required to comply with every subpoena you receive. Illinois Supreme Court Rule 201(c)(1) allows the court, on its own initiative or on motion of any party or witness, to deny, limit, condition, or regulate discovery to prevent unreasonable annoyance, expense, embarrassment, disadvantage, or oppression.11Illinois Courts. Illinois Supreme Court Rule 201
A motion to quash asks the court to throw the subpoena out entirely. A motion to modify asks the court to narrow its scope. Either has to be filed before the compliance date, and the objecting party has to explain why compliance should not be required. Common grounds:
- Privilege. The subpoena seeks attorney-client communications, mental health records without a court order, physician-patient information, or other legally protected material.
- Undue burden. The request demands an unreasonable volume of records on short notice, or forces a nonparty to bear disproportionate costs.
- Overbreadth. The subpoena is not tailored to the issues in the case and reads as a fishing expedition.
- Bad faith. The subpoena was issued primarily to harass, gain tactical advantage, or obtain information with no legitimate connection to the litigation.
Judges have flexibility. Rather than quashing outright, a court might narrow scope, extend the compliance deadline, order the requesting party to cover production costs, or enter a protective order restricting how disclosed information can be used.
What Happens If You Ignore a Subpoena
If you neither comply nor move to quash, the issuing party can ask the court to compel compliance. Courts have broad discretion: order immediate compliance, impose monetary penalties, require the non-compliant party to pay the other side’s attorney’s fees, or hold the person in contempt.
Contempt in Illinois can be civil or criminal. Civil contempt is coercive; the sanctions continue until the person complies. Criminal contempt is punitive, punishing past disobedience. Both can involve fines and incarceration.
Body Attachment Orders
When a witness refuses to appear, the court can issue a body attachment order authorizing law enforcement to detain the person and bring them to court. For nonparties, Rule 204(d) adds a safeguard: the court cannot issue a body attachment without proof that a rule to show cause or contempt order was personally served on the nonparty, along with a copy of the underlying subpoena or discovery order.3Illinois Courts. Illinois Supreme Court Rule 204 A nonparty who misses the date gets a show-cause order and a chance to explain before any arrest.
Sanctions for Subpoena Abuse
Enforcement runs both directions. An attorney who issues a subpoena in bad faith or as a harassment tool can be ordered to pay the opposing side’s reasonable expenses, including attorney’s fees, when a motion to compel is denied because the subpoena was unjustified. Repeated abuse can draw professional discipline.
Out-of-State Cases: The UIDDA Route
If someone needs testimony or documents from a person in Illinois for a case pending in another state, the Uniform Interstate Depositions and Discovery Act (735 ILCS 35/1 et seq.) is the vehicle. Illinois adopted the UIDDA effective July 20, 2015. The process runs in three steps: the attorney gets a subpoena from the court where the case is pending, presents it to the clerk in the Illinois county where the witness or documents are located, and the Illinois clerk issues a local subpoena for service.
Domesticating the out-of-state subpoena is not a court appearance, so the out-of-state attorney does not need to be admitted in Illinois or bring in local counsel just to get the subpoena issued. But if a motion to quash, modify, or enforce follows, an Illinois-licensed attorney has to appear on that motion. The domesticated subpoena has to comply with every Illinois rule covered above: service, witness fees, and privilege protections.