After all your replies I have found out more info. The controller concerned was asked if he/she would go for a breath test. The local police were not asked to attend. Furtheremore, only half of the staff who were working on the day were intervieved regarding the events of the day. Again there are two questions, Why was the controller concerned allowed to continue if it was thought that he/she was under the influence? and why were statements not taken from all staff directly involved with the controller?
If, how I remember it, on an ATC watch you will have controllers then supervisors/watch managers and above that the management team. Why did the immediate supervisors/watch managers not suspend the ATCO concerned?