A lawyer who finds work by persuading people injured in accidents to claim money from the person who caused the accident is called an ambulance chaser.
"Peterson and Scott are well-known ambulance chasers - that's how they make their money!"
This expression refers to the extent to which the authority or power of the law extends.
"He fled to South America hoping to escape the arm of the law."
bandit territory
A geographical area where law enforcement is practically impossible, because people ignore all rules, is called bandit territory.
"There are a certain number of bandit territories in the world where travellers are advised not to go."
behind bars
Someone who is behind bars is in prison.
"If you hang around with that gang, you'll find yourself behind bars in no time!"
beyond reasonable doubt
This is a legal expression which means that something is certain.
"The court established, beyond any reasonable doubt, that the man was innocent."
in black and white
This is a legal expression which means that something is certain.
"The court established, beyond any reasonable doubt, that the man was innocent"
blow the whistle
If you report an illegal or socially-harmful activity to the authorities, and give information about those responsible for it, you blow the whistle or you are a whistle-blower.
"He refused to blow the whistle on his boss for fear of losing his job."
breaking and entering
The term breaking and entering refers to the fact of entering a building or home illegally by breaking open a window, door, etc.
"The two men were found guilty of breaking and entering."