Bergerac (1981)

S3E1 Ninety Per Cent Proof

After a night of heavy drinking in despair over the acquittal of an arsonist he apprehended, Jim finds himself in a precarious situation. As he tries to recount his harrowing experience of being coerced into drinking and witnessing a murder, no one takes his story seriously. Desperate to prove his innocence and uncover the truth, Jim must navigate skepticism and his own demons to reveal what really happened that night.