Under what circumstance may a peace officer arrest without a warrant?

• A. When they observe a person violating any part of the laws
• B. Only with a warrant
• C. Only during daytime
• D. Only for traffic offenses

Answer: (A)

The key idea is that peace officers can arrest without a warrant when they witness a person committing a crime in their presence. This immediate authority exists because crime is actively occurring and the officer has probable cause to detain the suspect right away, without waiting for a warrant. The broad phrasing here reflects that any criminal violation observed in the act qualifies, not just certain types or under limited circumstances.

Why this fits best: observing a crime in progress provides the necessary justification to detain immediately, which is a recognized exception to the general warrant requirement. The other options aren’t correct because a warrant isn’t always required, arrests aren’t limited to daytime, and arrests for traffic offenses aren’t restricted to warrants or excluded from the in-presence rule.