Offenders incarcerated in Illinois are allowed to receive letters from anyone as long as the piece of mail does not have anything else with it such as jewelry or contraband of any sort. Be sure to put the inmate’s name and ID number on the envelope, and never place stickers on the envelope or letter, as this will cause the piece of mail to be rejected. Stickers have been used in the past to introduce illegal substances into the institution, so that is why they are so strict about stickers. All correspondence (with the exception of legal mail) is opened, inspected and read to ensure their is nothing that presents a danger to the security of the institution, such as plans to escape, maps, etc. Legal mail can be opened to check for contraband but only in the presence of the inmate, and will not be read.
Inmates can also receive books (more on that below) and photographs. All photos must be no larger than 4″x6″ and may not contain nudity. The photos may not be instant or Polaroid. You can use plain envelopes and envelopes padded with clear bubble wrap, all other types of envelopes like the ones that contain diamond dust and corrugated cardboard are not allowed and will result in what you send being returned.
Illinois prison inmates looking for pen pals
You should format all mail that you send to your Illinois inmate as follows:
Inmate Name, ID Number
PO Box or Street address
City, State, Zip code
To send books to your inmate, they must meet certain criteria.