 Most of the unit understands the decision, but Detective Jimmy McNulty angrily objects, pointing out that Stringer is clearly a more prolific trafficker than their new target.This brings McNulty into conflict with Detectives Lester Freamon, with Kima Greggs caught in the middle and Roland Pryzbylewski and Leander Sydnor disenchanted with the less interesting Williamson.As a result, the MCU, previously the most effective unit in the Baltimore Police Department, is temporarily compromised, and Stringer is able to operate without interference for a time.