Simple English definitions for legal terms
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An unreasonable search and seizure is when a search or seizure is done without a legal search warrant or without probable cause. This violates the Fourth Amendment, which protects people's privacy against government officers. The Fourth Amendment says that people have the right to be secure in their persons, houses, papers, and effects against unreasonable searches and seizures.
If an unreasonable search or seizure happens, the evidence obtained cannot be used in criminal trials. This is called the exclusionary rule. However, this rule does not apply to other court proceedings, impeachment of evidence against the defendant, or civil proceedings.
Qualified immunity protects government employees from being personally sued by the defendant. This means that even if the evidence is excluded, the officer who performed the unreasonable search or seizure cannot be sued.
There are exceptions to warrantless searches, such as the plain view doctrine, exigent circumstances, hot pursuit, consent, administrative search, and stop and frisk. If a government officer has a search or seizure warrant that turns out to be invalid, evidence seized via their search or seizure may not be excluded if they acted in good faith.
These examples illustrate how an unreasonable search and seizure can happen and how the exclusionary rule and good faith exception work.