The Exclusionary rule is the rule that prohibits the use of illegally seized evidence in court.
What is it?
Fruit of the poisoned Tree
"Inevitable Discovery" Exception
"Good Faith" Exception
Fruit Of The Poisoned Tree
Big case controversial case : MAPP VS OHIO
This rule forces police to gather evidence properly. If they are careless or abuse the rights of the suspect, they are unlikely to get a conviction. As well as violating fourth amendment rights.
Evidence that is acquired through the use of illegally obtained evidence and is therefore inadmissible in court
The "Inevitable Discovery" Exception
For example, say Johnny told the police he did not start any fires in the area. The officers popped the trunk of Johnny's car and found a gas can. The fires were started with gas and a witness placed Johnny at the scene of the fire before the fire started. The officers opened the trunk without consent but they would have been able to get a warrant to search the vehicle. The gas can was found illegally because they did not have consent to search, but they would have inevitably obtained a signed warrant to search the vehicle. This would be inevitable discovery.
The legal principle that illagally obtained evidence can be admissible in court if police using lawful means would "inevitably" have discoverd it.
"Good Faith Exception"
The legal principle that evidence obtained with the use of a technically invalid search warrant is admissible during trail if the police acted in good faith when they sought the warrant from a judge.
For example, if officers attach a GPS to a car without a warrant because existing law allows them to, but a later Supreme Court decision holds that warrants are required, evidence found pursuant to the GPS search will probably be admitted. (U.S. v. Sparks, 711 F.3d 58, 68 (1st Cir. 2013).)
Each of the three parts to the Exclusionary rule are important to day to day life. They each Impact the criminal justice system by holding the police to certain standards when it comes to gathering evidence and getting convictions.