Ok, I have a possible solution:
Tags are only awarded at stations which will act as dispensers. From a logistical standpoint, Erin is right. I still think the RF shooter should shoot tags. Every tag the station dispenses will look exactly the same, from the outside. So, when an agent picks up a tag, they will have no idea who left the tag there. They will need to use a station to decode the message to determine its validity or if there isn't enough time, they can chance it and take the tags message and run with it.
I think we need to think of this game in terms of team members. In order to play the game, there must be at least 4 players with at least 2 on each team. In an museum environment, this should not be difficult to accomplish.
Each agent can reprogram a tag they received from a station to contain a helpful valid clue or a misleading invalid message. They would use the RF shooter to accomplish this. Agents on the same team can either decide to send helpful messages to their teammates or misleading information to divert an enemy agent.
