In municipalities with 1,000,000 or more population, any taxicab manufactured, owned or operated after September 1, 1970, and regularly operated in such a municipality must have a bullet proof shield completely separating the driver's seat from the back seat.
625 ILCS 5/12-605
Taxicabs-Bullet proof shields
P.A. 80-911.
Official source: Illinois General Assembly. Reproduced from public-domain Illinois statutes; confirm against the official source for the current text. Not legal advice.