Connecticut requires even allegation of abuse to be reported to hotline and then faxed within 12 hours and a follow up in 3 days as to what the outcome of the investigation. EVEN if two residents get in to it and they are demented it gets reported.
Federal regs require every allegation to be reported and investigated. It seems your investigation revealed that no abuse happened. Tho a little difficult, any time I feel that a resident puts the employee at risk (with unfounded allegations or the risk for them) I simply require 2 staff members to be present when any care given or require the aide that doesn't gee haw to swap for another resident and stay out of that room- so far this has worked with the difficult residents.