Reasonable grounds.

RCW 46.04.455
in effect
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"Reasonable grounds," when used in the context of a law enforcement officer's decision to make an arrest, means probable cause. "Reasonable grounds," when used in the context of a law enforcement officer's decision to make an arrest, means probable cause.
Source: WA Statutes (Official Site)URL: https://app.leg.wa.gov/RCW/default.aspx?cite=46.04&full=trueFetched: 6/29/2026

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