(725 ILCS 5/108A-4) (from Ch. 38, par. 108A-4)
Sec. 108A-4. Grounds for Approval or Authorization. The judge may authorize or approve the use of the eavesdropping device where it is found that:
(a) one party to the conversation has or will have consented to the use of the device;
(b) there is reasonable cause for believing that an individual is committing, has committed, or is about to commit a felony under Illinois law;
(c) there is reasonable cause for believing that particular conversations concerning that felony offense will be obtained through such use; and
(d) for any extension authorized, that further use of a device is warranted on similar grounds.
(Source: P.A. 79-1159.)