Trivia: The scene where the drunkard sees the car go above him and thinks it's just his imagination is a homage to the Bond movies "The Spy Who Loved Me", in which a character has the same reaction when the car drives out of the water, and "For Your Eyes Only", in which that same character has the same reaction when Bond skis overhead.
Trivia: Jason Statham has reportedly said that "Transporter 2" is his favorite film out of the original "Transporter" trilogy.
Answer: The police will just get in the way and slow things down too much. Frank can operate outside of the law and get more done and get it done quicker. Plus, they can't just take Audrey's word for it.
TedStixon