The history of American against American violence goes back over a hundred years to the Civil War, the Ku Klux Klan, and more recent violence against Dr. Martin Luther King and the freedom marchers of the 1960's, but this new wave of violence in US cities can probably be traced back to the 1970's with the advent of the "drug war." Republican President Nixon declared a "war on drugs" in 1971 and his administration began proposing the "No-knock Laws," co-sponsored by JFK's brother, Democrat Edward Kennedy in the US Senate. https://en.wikipedia.org/wiki/No-knock warrant These laws effectively repealed the Fourth Amendment in the Bill of Rights which stated: "The right of the people to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures, shall not be violated, and no Warrants shall issue, but upon probable cause, supported by Oath or affirmation, and particularly describing the place to be searched, and the persons or things to be seized." The Fourth Amendment had codified the unwritten English common law that "A man's home is his castle," expressed by William Pitt in this way: "The poorest man may in his cottage bid defiance to all the forces of the crown. It may be frail - its roof may shake - the wind may blow through it - the storm may enter - the rain may enter - but the King of England cannot enter. All his forces dare not cross the threshold of the ruined tenement." The No-Knock Laws were deemed Constitutional by the US Supreme Court, which has also abandoned Due Process in more recent decisions such as condoning the NSA spying on US citizens and the droning of American citizens in the "war on terror." http://www.csmonitor.com/USA/USA-Up...erican-citizens-killed-in-drone-strikes-video The original No-knock Laws applied only to the District of Columbia, but have since have spread to every major city in the country, along with the militarization needed by local police to enforce these laws, creating a cycle of escalating violence and reducing respect for police. Law Enforcement Against Drug Prohibition (LEAP), whose officers and speakers include only current and retired police and other law enforcement officers, has produced documented statistics of the negative unintentional consequences of the current war on drugs. http://www.leap.cc/
