Whosoever is right or wrong here, the above course of action seems reasonable as a standard precaution whilst CRT investigate. If you had allegedly assaulted an official in most walks of life it is likely, and again probably reasonable, that there would be an immediate sanction placed upon you whilst the incident was investigated. Hearing your side of the story should be part of that forthcoming investigation, not in deciding the initial immediate action.
The investigation timescale doesn't seem unrealistic and CRT may yet find in your favour, so I'd say the correct action is to comply with their instructions. Actually, if you don't, then it's likely to totally undermine your own defence and the employee, if he is at fault, will not be held to account.