It was cociane mate and a heavy two night useIf they bring drinking up tell them that you do not drink regularly. If they ask you to go into more detail, tell them you rarely have a drink and you do not keep records. They try to put you on the spot and make you say something that can be used against you.
A test would be 3 or 6 month overview. If your lapse was brief, weeks rather than one month plus, it should not make a bad result.
Thanks