doesn't the average cop has no more than a high school education?........
I'll give your sentence a try... I think you want to know if the average cop only has a high school education.
Generally, most departments of any significant size will have some minimum college hours required. For many of the more professional departments a 2 yr degree is required. But I'm sure given the vast number of agencies out there, some as small as 2 man "departments" you can find many that don't require any college.
Usually, there is an attempt to balance what you as a department would like the minimum criteria to be, with trying to get enough eligible candidates to fill the vacancies. If you set an associates as the minimum education, what will you do when you can't fill those vacancies with bodies? So it's a matter of setting reasonable criteria to get the best potential candidates and still have enough recruits to run your department