It might be hard to know if someone is a bounty hunter. Bounty hunters are allowed to disguise their identities and do not need to identify themselves. There is no official registration or licensing process. Because of this, there is no easy way to know if they are "legitimate" bounty hunters.
Bounty hunters may be in plain clothes or in more tactical gear. Some bounty hunters wear tactical vests that say “Fugitive Recovery Agent,” “ICE,” and/or “Bail Agent.” Others may wear plain clothes or even a disguise. There have been reports of bounty hunters using vans, cars, and trucks with fake decals.