<P> The doctrine is subject to four main exceptions . The tainted evidence is admissible if: </P> <Ol> <Li> it was discovered in part as a result of an independent, untainted source; or </Li> <Li> it would inevitably have been discovered despite the tainted source; or </Li> <Li> the chain of causation between the illegal action and the tainted evidence is too attenuated; or </Li> <Li> the search warrant was not found to be valid based on probable cause, but was executed by government agents in good faith (called the good - faith exception). </Li> </Ol> <Li> it was discovered in part as a result of an independent, untainted source; or </Li> <Li> it would inevitably have been discovered despite the tainted source; or </Li>

Describe the fruit of the poisonous tree doctrine