[chris37]

Probable cause isn’t needed for arrest.

Reasonable suspicion is.

[ravenwolf]

Probable cause isn’t needed for arrest.

Reasonable suspicion is.

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According to the story the management was at least partly in charge, why did they march him to the office with hand cuffs?

You are right, probable cause is for the issue of a warrant which is needed for search or seizure but is done every day with out one due to the fear of the police.