Adam Fanospour committed gross misconduct while on a course in January this year, a misconduct hearing found.
His behaviour “fell way short of the standards required” by an officer on or off duty, said Detective Chief Superintendent Tim De Meyer.
The ex-officer, who was based at Abingdon police station, was present at yesterday’s misconduct hearing which was held before Assistant Chief Constable Nicola Ross.
He was dismissed for breaching the standards of professional behaviour for honesty and integrity and discreditable conduct while at the probationer development unit at Sulhamstead Training College.
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Mr De Meyer, Head of the Force’s Professional Standards Department, said: “Mr Fanospour’s failure to pay for items that he took from the training college canteen fell way short of the standards required.
“His dismissal shows that we will investigate misconduct thoroughly and deal with it robustly.”