In the American Legal system there are instances where a witness may give Federal prosecutors information about an alleged crime in exchange for limited immunity from prosecution. This is commonly called "Queen for a Day". wisenberglaw.com/Articles…
During WWII, Finnish businessman Tor Borg trained his dog to raise one paw when the word "Hitler" was mentioned in a parody of a Nazi salute. The Nazi Foreign Office spent three months trying to prosecute him for insulting Hitler but failed to find any witnesses. en.wikipedia.org/wiki/Jac…
In 1966 boxing legend Rubin "Hurricane" Carter was wrongfully jailed for murder. The prosecution's key witnesses came forward months after the crime once a $12,000 reward was offered. They claimed to be in the area robbing a factory scapegoat.podbean.com/e/h…
In 11 states in the US there is law called the "911 Good Samaritan Law" where if someone is experiencing a drug overdose or is witnessing a drug overdose and they call 911 they can't be prosecuted for misdemeanor possession of drugs or paraphernalia or underage drinking. abclocal.go.com/wtvd/stor…

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