Amends the Illinois Police Training Act. Provides that probationary police officers do not include lateral hires or previously certified officers reentering the profession seeking a training waiver. Modifies the composition of the Illinois Law Enforcement Training Standards Board. Makes changes to provisions regarding automatic decertification of full-time and part-time law enforcement officers; discretionary decertification of full-time and part-time law enforcement officers; review of final administrative decisions; decertification procedures; full-time law enforcement and county corrections officers; law enforcement compliance verification; mandatory training for a police chief and deputy police chief; and sexual assault and sexual abuse training. Removes and repeals existing provisions about in-service training and replaces the existing provisions by requiring the Board to establish a system for the development, delivery, and tracking of in-service training courses, including specific requirements of the training. Amends the Counties Code to make a conforming change. Effective immediately.