The pool of available police candidates is larger in areas like DFW, and cities can have higher standards of recruitment.
Example: Arlington, Texas - Must have a Bachelor�s Degree from an accredited college or university. Upon entry to Academy they receive $4128/mo, after 4.5 years they receive $5530/mo, generous benefits/etc; sgts/officers do even better.
http://www.arlingtonpd.org/recruiting_SALARY.htmlAll of this doesn't mean that every officer will not make mistakes, but hopefully they're hiring the best available and don't have to settle for questionable characters. This works in the citizens favor, hopefully.