Why do police have such out-of-date psychological theories?

“Research has demonstrated that none of these statements is true, yet we found that, in our questionnaire of 50 true or false items just like this, our sample of police officers scored no better than the general public. Police officers got 39 per cent wrong and members of the public got 37 per cent wrong. The police seemed to know as little about these important policing issues as everybody else.”