Probable Cause / Reasonable Grounds
Definition
The standard of suspicion required before a warrant may issue or a warrantless search may occur. In US law, probable cause requires a reasonable belief, based on articulable facts, that evidence of a crime will be found. The equivalent in England and Wales is 'reasonable grounds to believe'; in India the BNSS uses 'reason to believe'.
- US term
- Probable cause
- England & Wales term
- Reasonable grounds to believe
- India (BNSS) term
- Reason to believe
- Applies to
- Warrants and warrantless searches
Common questions
Is probable cause the same threshold as proof beyond reasonable doubt?+
No, probable cause is a much lower bar. It requires only a reasonable belief supported by articulable facts that evidence or contraband will be found, not certainty or even a preponderance of the evidence, which is why it can justify a search long before guilt is assessed.
Why do forensic practitioners need to understand this standard even though it precedes their involvement?+
If the underlying search or seizure lacked probable cause or its jurisdictional equivalent, any evidence recovered can later be suppressed or excluded, meaning a scientifically sound examination can still be rendered inadmissible for a legal defect that occurred before the exhibit ever reached the laboratory.
Related terms
- Chain of Custody
- The documented chronological record of who collected, handled, transferred, and examined a piece of evidence. For digital evidence, chain of custody includes...
- Exclusionary Rule
- A rule that evidence obtained in violation of constitutional or statutory search-and-seizure requirements cannot be used at trial. Applied strictly and automatically...
- Fruit of the Poisonous Tree
- A US doctrine extending the exclusionary rule: not only is unlawfully obtained evidence itself excluded, but any further evidence discovered as a...
- Plain-View Doctrine
- A rule permitting an officer who is lawfully present in a location to seize evidence whose incriminating character is immediately apparent, without...
- Search Warrant
- A judicial order authorising officers to enter and search a specified place and seize specified items. In most systems it must describe...