Should law enforcement agencies  be allowed to use racial and ethnic pratices? why or why not?:
Yes to an extent, what is commonly refered to as racial profiling makes sense (when not abused). For example: 
A car load of black or hispanic kids are rolling around a lets say mostly white upscale neighborhood at 3 am,plates get run, and it's pretty obvious they don't live in the area and may be up to no good I believe is an acceptable type of profiling.
 I will say the same for a car load of suburban white boys driving around the hood,in high drug areas etc. That contrary to popular belief is also profiling.   Crime needs to be controlled and I dont personally see it as a violation of ones right's to be stopped when they are deemed to be suspicous.  Of course people will call me racist etc, but to an open mind what I just stated makes sense and is fair.