I clearly referred to LAPD SWAT and one or more special squads in LAPD, the Special Investigations Squad (S.I.S.) for example,
A note on such units:
Having taught firearms to swat teams, I can assure you they are no better then the street cop when it comes to marksmanship. The same applied to the military, include special units or snipers.
Regardless of your job, you don't go to school, learn to shoot and are good to go and expect to remain proficient. It doesn't work that way.
It takes practice and training to remain proficient. Lots of practice.
If one cares, and practices, takes in local matches. Continues his training and practice, he'll excel regardless if he is a street cop, swat, military, infantry SOs, sniper or what have you.
If he doesn't. If he qualifies once a year, or even twice and year, and that's it. He wont excel.
Its whether one cares about his shooting that counts, not the gun, be it Glock, Colt, or revolver. Its the shooter that makes a difference.
The Weapons & Materials Research Directorate of the Army Research Laboratory published a white paper of these efforts called Sniper Weapon Fire Control Error Budget Analysis
In this report, they compared civilian target shooters with military snipers. This dealt with shooting and not the other aspects of the sniper craft.
The military snipers could not compete with the civilians, simple because they don't put in the effort needed to remain proficient, the civilian shooters did.
Four categories were tested.
Sniper quality Best Worst
Competitive Rifleman Best worse
Best Sniper error .30 Mil Error
Worse Sniper error .80 mil error
Best Civilian Competitior .10 mil error
Worst Civ. Competitior .30
Again, its the interest of the shooter, and the willingness to put the effort in to master his craft.