If you equip a weapon, mask, or attachment from a DLC you do not legally own on Steam, the game scans your inventory during the "Crew Setup" screen. If it finds an invalid item ID, you get the tag the second the heist loads.
If you see the yellow tag, don't panic. If you are a clean player, a quick game restart or verification of files usually solves the issue. If you are cheating, understand that the Payday 2 community is famously toxic toward cheaters. Most lobbies with "Cheater Tag" detection enabled will auto-kick you within 10 seconds. payday 2 how to know if you have a cheater tag top
: Using more deployables (like doctor bags or sentry guns) or throwables than your skills and loadout allow. If you equip a weapon, mask, or attachment