Why Police Lie Under Oath

[antiquie]

6. They even have a word for it: testilying

Police perjury (or testilying in United States police slang) is the act of a police officer giving false testimony. It is typically used in a criminal trial to "make the case" against a defendant who the police believe to be guilty when minor irregularities during the suspect's arrest or search threaten to result in acquittal on a technicality. It has broader meanings. It also can be extended further to encompass substantive misstatements of fact for the purpose of convicting those whom the police believe to be guilty, or even to include statements to frame an innocent citizen. More generically, it has been said to be: "Lying under oath, especially by a police officer, to help get a conviction."

http://en.wikipedia.org/wiki/Police_perjury