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.
If a statement, document, or other form of testimony is under penalty of perjury, it means it is a situation in which the laws of perjury apply. Anyone giving a deposition, testifying as a witness, primary party, or expert in a court case may be required to give an oath not to commit perjury.