It wont matter. DC cops are the dumbest bunch of cops on the planet....well not as dumb as federal ATF....but REAL dumb. I don’t care if you are legal ccw or not in DC, it will take about 3 years for the information to get down to the street-level bureaucrat.
I have never been to DC. At one time I wanted to go, but no longer. I wanted to see the Vietnam wall. But I saw the traveling wall a few years back. So that was good enough. I simply stay in the south. Here, I can carry and have no problems. Simple as that.
Speaking of dumb ATF agents, I read a story where an ATF “weapons expert” was called in to determine if a particular was an illegally modified machine gun. The agent took the gun (a FAL) and cocked it and dry fired it a bunch of times and declared it to not be a machine gun. He must REALLY be an “expert” if he can determine if a gun is a machine gun or not by dry firing it and not disassembling it to determine if it has been modified to accept an auto sear. I can look at a FAL and tell you within a few seconds if it has an auto sear modification.