[sweetliberty]

I think it was "The Couch Trip."

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Plot Summary for
The Couch Trip (1988)

The escaped delinquent John Burn deputizes for dr. Maitlin, saying he's the psychiatrist Lawrence Baird. He scores as a radio- psygologist and is very popular. But then dr. Maitlin meats the real dr. Lawrence Baird at a congress in London...

(The spelling etc. isn't mine!)