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.
Police misconduct. Police misconduct refers to ill-appropriated conduct and or illegal actions taken by police officers in connection with their official duties. Police misconduct can lead to a miscarriage of justice and sometimes involves discrimination and or illegal motives of segregation combined as obstruction of justice.