Depending on the departments policy, always err on the side of caution. A letter and a gift that cannot be construed as monetary in nature should be sufficient. Either way, he will be grateful!
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AUDACES FORTUNA JUVAT
MOLON LABE
"There are those amongst us that live in rooms of experience that you and I can never enter...." - John Steinbeck
"Life's journey is NOT to arrive at your grave safely in a well preserved body, but rather to skid in a$$ backwards & sideways, totally worn out, shouting "holy $H!T, what a ride!" - Unknown
There's gotta be one fish down there dumber than I am drunk.