In criminal law, police perjury, sometimes euphemistically called "testilying",[1][2] is the act of a police officer knowingly giving false testimony. It is typically used in a criminal trial to "make the case" against defendants believed by the police to be guilty when irregularities during the suspects' arrest or search threaten to result in their acquittal. It also can be extended to encompass substantive misstatements of fact to convict those whom the police believe to be guilty, procedural misstatements to "justify" a search and seizure, or even the inclusion of statements to frame an innocent citizen.[1][3] More generically, it has been said to be "[l]ying under oath, especially by a police officer, to help get a conviction."[4]