I thought lying under oath has been perfectly legal since 1998.
He can deal with it at trial by testifying that "he had forgotten the incident ... it was so insignificent ...." and didn't intend to mislead anyone with his sworn statement.
These allegations are garbage anyway. Can anyone imagine prosecuting a cop for using profanity? It goes with the territory !
Besides, everyone knows all cops are M @#$%^$&^$%@# anyway.