It’s used by:
nationewide paramilitary SWAT
Regional SWAT teams (8 teams covering 14 regions, in near future there will be probably 14)
Public Order Units - they use minibuses carrying 7 cops, they do mostly riot duties with riot gear, but when there is anything that might require large number of armed officers, then they put on the body armor and G36s.
Rapid Response Units - cop cars mostly with 3 cops in each, they are patrolling streets as immediate backup to the district policemen with G36 in safe in the car trunk
(Couldn’t find a pic with G36, but this is what the first cops who arrive will likely look like when you call in anything violent in Prague).
“Normal” district cops usually have in their car Scorpion EVO 3, HK MP5 or HK MP7s. Some may have old vz.61s and vz.58s, but these are becoming increasingly rare, catching dust in the station armories as the new guns are coming in. (Some prefer to have vz.58s because that is what they are used to and what train with in private though).
FYI http://www.thetruthaboutguns.com/2015/08/foghorn/germany-officially-ditches-g36-for-hk417/