Where a defendant enters a negotiated guilty plea, they waive all non-jurisdictional errors, including constitutional errors, and may not later raise such errors in post-conviction petitions seeking to alter their conviction or sentenceThe 1st District Appellate Court affirmed the decision of Cook County Associate Judge James B. Linn.On March 28, 2011, Prince Watson, 17, was riding the CTA’s Brown Line when he grabbed an iPhone belonging to another passenger and fled out Fullerton Station and down the crowded stairs …