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 a criminal offense, punishable by fine or jail time, but it must be prosecuted by the District Attorney--who does not have the time. Family Court judges have the ability to sanction (fine) parties, but no time to truly determine that one party is lying. Instead, they may assume both parties are lying or just weigh their credibility. With no specific consequence, the risks of lying are low. Personality Disorders and Patterns of Lying.