Police: Through a Fine Screen

As a result of their recent appearance on TV, Chicago's police will have to work hard to erase the impression that they are a gang of undisciplined bullies. Whatever their image, though, the fact is that Mayor Daley's cops are among the most carefully screened in the nation.

To begin with, each candidate is asked to write a brief autobiography specifically aimed at revealing emotional instability. He then takes a psychological sentence-completion test and an exam known as the Minnesota Multiphasic Personality Inventory. If his responses raise any doubts about him, the...