I have contended that the greatest power a license to practice law confers is the power to compel powerful people to testify under oath. But police have developed a countermeasure. It’s called lying. It’s a powerful device because it’s institutionally protected. Few lawyers can beat them head on. They will always be “believed.” Cops sardonically call it “testilying.” However, there is a workaround. It involves maneuvering them into telling the wrong lies. To do this, you have to exploit a common character flaw – hubris. Cops who lie are generally infected with a compulsion for dominance. They need to let you know they are lying and that you can’t do anything about it.