Just to add to that, there are also cops who specialise in certain aspects of "Policing" ie. Collision Investigation, Forensics, Crime Investigation, Traffic, Family Liaison etc. It takes a lot of training and years of experience to become very competent in any area of these specialist roles and due to the lower numbers involved, they tend to be utilised, only in more serious cases.
Hopefully without sounding disrespectful to CopperCyclist and forum colleagues, 24/7 response (panda) crews tend to be younger in service and less experienced, and have to be "jacks of all trades" for want of a better phrase.
You can't possibly turn out a fully fledged and fully experienced cop, after only two years probation and ask them to be fully conversant with every act and section, of every law.... it just can't be done !
Experience is gained over time.