I was trying to find the tattoo policy for the Capitol police. Seems there were some issues awhile back in 2012 where they wanted to implement that everything be covered, but the there was pushback - heat, etc. I couldn't find anything more current, but I did find the job description in the careers section and under how you will be evaluated:

Uniform and Grooming Standards -- A USCP Police Officer will be required to wear a USCP-issued uniform while in duty status. Males must be clean shaven. Hair of male and female officers must be neatly groomed and worn off the uniform collar and tucked under the USCP-issued uniform hat. 

https://uscp.csod.com/ux/ats/careersite/1/home/requisition/13?c=uscp

EDIT: crap, this guy is DC Metro. Must keep looking.

I was trying to find the tattoo policy for the Capitol police. Seems there were some issues awhile back in 2012 where they wanted to implement that everything be covered, but the there was pushback - heat, etc. I couldn't find anything more current, but I did find the job description in the careers section and under how you will be evaluated:

Uniform and Grooming Standards -- A USCP Police Officer will be required to wear a USCP-issued uniform while in duty status. Males must be clean shaven. Hair of male and female officers must be neatly groomed and worn off the uniform collar and tucked under the USCP-issued uniform hat. 

https://uscp.csod.com/ux/ats/careersite/1/home/requisition/13?c=uscp