friendly suit
n. a lawsuit filed in order to obtain a court order when the parties to the suit agree on the expected outcome. Such a legal action will be dismissed if it is an attempt to get an advisory opinion,

frisk
v. quickly patting down the clothes of a possible criminal suspect to determine if there is a concealed weapon. This police action is generally considered legal (constitutional) without a search warrant. Generally it is preferred that women officers ...

frivolous
adj. referring to a legal move in a lawsuit clearly intended merely to harass, delay or embarrass the opposition. Frivolous acts can include filing the lawsuit itself,

fruit of the poisonous tree
n. in criminal law, the doctrine that evidence discovered due to information found through illegal search or other unconstitutional means (such as a forced confession) may not be introduced by a prosecutor.

frustration of purpose
n. sometimes called commercial frustration, when unexpected events arise which make a contract impossible to be performed, entitling the frustrated party to rescind the contract without paying damages.

fugitive from justice
n. a person convicted or accused of a crime who hides from law enforcement in the state or flees across state lines to avoid arrest or punishment. Under Article IV, Section 2 of the U.S. Constitution,

full disclosure
n. the need in business transactions to tell the "whole truth" about any matter which the other party should know in deciding to buy or contract.