Usps Uniforms

The people of USPS delivery are wearing their blue uniforms, then you can always tell if they were legitimate workers USPS they came to your door. Now I see around in jeans and a t-shirt. Why are they not required to wear the uniform correctly and positively represent the USPS? Also, I see my local driver smoking in his delivery vehicle. Are they allowed to smoke in their vehicles for which the delivery of mail? Cigarette smoking may fall and burn the e-mail.

Most, I see, do. The only I did not, rural carriers are using their own car.