Quote Originally Posted by http://www.guysoflidar.com/usa-laser-jammer-laws.html
In Illinois, Laser Jammers are illegal.

Source: Illinois Vehicle Code 625 ILCS 5/12-613

Sec. 12-613. Possession and use of radar or laser jamming devices prohibited.

(a) Except as provided in subsection (b), a person may not operate or be in actual physical control of a motor vehicle while the motor vehicle is equipped with any instrument designed to interfere with microwaves or lasers at frequencies used by police radar for the purpose of monitoring vehicular speed.

(b) A person operating a motor vehicle who possesses within the vehicle a radar or laser jamming device that is contained in a locked opaque box or similar container, or that is not in the passenger compartment of the vehicle, and that is not in operation, is not in violation of this Section. (c) Any person found guilty of violating this Section is guilty of a petty offense. A minimum fine of $50 shall be imposed for a first offense and a minimum fine of $100 for a second or subsequent offense.

(d) The radar or laser jamming device or mechanism shall be seized by the law enforcement officer at the time of the violation. This Section does not authorize the permanent forfeiture to the State of any radar or laser jamming device or mechanism. The device or mechanism shall be taken and held for the period when needed as evidence. When no longer needed for evidence, the defendant may petition the court for the return of the device or mechanism. The defendant, however, must prove to the court by a preponderance of the evidence that the device or mechanism will be used only for a legitimate and lawful purpose.

(d) A law enforcement officer may not stop or search any motor vehicle or the driver of any motor vehicle solely on the basis of a violation or suspected violation of this Section.

(Source: P.A. 94-594, eff. 1-1-06.)
what exactly does section (d) mean...if they can't stop or search for it how will they know its there...