20 ILCS 805/805-105
The Department has the power to take all measures necessary for the conservation, preservation, distribution, introduction, propagation, and restoration of the fauna and flora, except where other laws designate responsibilities specifically to other governmental agencies. The Director and authorized employees of the Department may expend sums the Director deems necessary to purchase any fauna and flora or parts thereof protected by the Department for use as evidence of a violation of the Fish and Aquatic Life Code, the Wildlife Code, or any other Act administered by the Department and may employ persons to obtain that evidence. The Director is authorized to establish investigative cash funds for the purpose of purchasing evidence or financing any investigation of persons suspected of having violated those Acts. The investigative cash funds shall be operated and maintained on the imprest system, and no such fund shall exceed $10,000. The Department is authorized to deposit the money in a locally held bank account. The funds to be expended shall come from public donations, proceeds from the sale of flora and fauna no longer or not needed as evidence that were purchased with investigative cash funds, and appropriations to the Department for contractual services.
20 ILCS 805/805-105