Where a police officer makes a promise not to arrest and charge a suspect in exchange for suspect’s cooperation, the officer has the full authority to make that promise and it is therefore enforceable.The Illinois Appellate Court, 1st District, reversed and vacated a decision by Cook County Circuit Judge Charles P. Burns.On June 21, 2006, just after midnight, Darven Marion was approached by seven or eight police officers while standing outside his car.According to Marion, they took keys from his car, and some of the …