Where a defendant was arrested on suspicion of probable cause, but the only crime for which the police possessed probable cause is later determined to be unconstitutional ab initio, then the arrest is unconstitutional and should be quashed, and any evidence gathered in the process of the arrest must be suppressed.The 1st District Appellate Court reversed the decision of Cook County Associate Judge Dennis J. Porter.On April 27, 2011, at 10:50 p.m., four Chicago police officers in two police cars were patrolling a high crime …