CSC Event Staff, which provides security and crowd control at Nationals Park, is using DMR on 463.8000. This frequency has been licensed by CSC for some time, and the company used it at one point in analog mode. Recently, however, they were using 464.7500 unlicensed.
CSC is using several talkgroups on the frequency:
463.8000 [ ] Gates/Security (DMR - Color Code 13, Slot 1, Group 207)
463.8000 [ ] Field (DMR - Color Code 13, Slot 2, Group 208)
Another talkgroup was active briefly on slot 2, and it may have been used for clubhouse/player/VIP security.