caniplaywithmadness is absolutly right, managers have no right or power (or probably ability) to require a breath test, only a Constable may do so.
What breach of the rules they have suspended the controller over I have no idea, but by allowing him to continue to work after thay have been made aware they have condoned it......
ILS 119.5, It is up to Police to Breath Test, they should have been called, initial suspcison can come from someone else, but its the Police officers decision not managements to administer a test, based on what he finds when he arrives.