A miscarriage sometimes happens because there is a weakness of the cervix, called an incompetent cervix, which cannot hold the pregnancy. A miscarriage from an incompetent cervix usually occurs in the second trimester. There are usually few symptoms before a miscarriage caused by cervical insufficiency.
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 irregularities during the suspect's arrest or search threaten to result in acquittal.
Perjury is the act of willfully giving incomplete, misleading, or false testimony while under oath. The term perjury is most often used to refer to testimony given during a court trial. What someone testifies in court, the judge and jury believe that person to be truthful and reliable. The Fifth Amendment, part of the US Bill of Rights, addresses due process, double jeopardy, self-incrimination, and eminent domain.