Collocations for police - noun

armed, mounted
plain-clothes, uniformed
undercover
riot, traffic
military, paramilitary, secret, security
airport, border, campus (esp. AmE), city (esp. AmE), county, federal, local, national, state
fashion, thought (both figurative)
Following this rule will keep the fashion police off your tail.

call, contact
alert, inform, notify, tell
involve
I'd really rather not involve the police.

elude, evade

arrest sb, detain sb
catch sb
charge sb
The police charged him with impaired driving.

patrol sth
raid sth
The police raided his shop.

arrive, respond
The police arrived to break up the battle.

interview sb, question sb
investigate sth
harass sb
appeal for sth (esp. BrE)
Police have appealed for witnesses to come forward.

captain, chief, commissioner (esp. AmE), constable (BrE), detective, inspector, lieutenant, officer
spokesman
investigator, official
department, headquarters, station
academy (esp. AmE)
cell (BrE)
He spent the night in a police cell after his arrest.

report
Police reports state that at around 6.30 p.m. Poole and a relative had an argument in his backyard.
Contact your local police department to file a police report. (AmE)

blotter (AmE)
His name has never shown up on the police blotter (= written record of arrests).

record
I had a police record.

car, cruiser (esp. AmE), helicopter, van (BrE), vehicle
an unmarked police car

siren
driver (BrE), marksman
dog, horse
uniform
authorities, force, service
unit
enquiries (BrE), investigation
interrogation, surveillance
escort
The visiting fans returned to the station under police escort.

patrol
A routine police patrol spotted signs of a break-in at the offices.

raid
Nine arrests were made in a series of police raids across the city.

presence
There was a huge police presence at the demonstration.

protection
All prosecution witnesses were given police protection.

barricades, cordon, lines
Some protesters managed to break through the police cordon.

checkpoint, roadblock
chase
shooting
informant, informer
abuse, brutality, corruption, harassment, misconduct, violence
state
The country looks more and more like a police state.

helping the police with their enquiries (BrE)
No arrest has been made, but a man is helping the police with their enquiries.

in police custody
He was held in police custody for a month