Yes, I agree -- we've discussed 'police' scores of times in this forum, so Reinhard really should have remembered.
Occasionally, some lone person has tried to claim that 'police' can be singular, based on a tiny number of dubious web hits that may just be mistakes. But the overwhelming consensus among native speakers here, not to mention dictionaries and grammar books, is that Polizei is singular but police is plural, period.
(The example with the proper name of a particular police force in BE, even without the word 'force' or (AE?) 'department,' may be an occasional BE exception. But if so, it should be called an exception, not confused with the basic rule.)
In other words, police is NOT in the same category as family, team, committee, etc., where there can be a difference in emphasis and also a difference in AE/BE usage.