De or het parketpolitie?

The correct Dutch article is:

de parketpolitie

Rule Words ending in -tie and -sie: almost always de. See the rule

How to use parketpolitie

the parketpolitiede parketpolitie
this parketpolitiedeze parketpolitie
that parketpolitiedie parketpolitie
our parketpolitieonze parketpolitie
your parketpolitiejouw parketpolitie
every parketpolitieelke parketpolitie
which parketpolitie?welke parketpolitie?
a big parketpolitie / the big parketpolitieeen grote parketpolitie, de grote parketpolitie