Can refer either to the police as an organization or to a police officer. The katakana form often feels loanword-like or stylized compared with the more standard 警察 and 警察官.
If you feel in danger, please call the police right away.
If you get into trouble overseas, ask a nearby police officer for help.
The local police increased their nighttime patrols.
He was caught by the police for speeding.
ポリス is the neutral loanword for 'police', while ポリ is its clipped, slangy, often derogatory shortening.
Written in katakana. No etymology or language of origin is specified.
bodyguard for VIPs; security police