Back in the "Kato Kin-Actions" post, I suggested that the chauffeur of Captain Amos Burke in 'Burke's Law' was once the sidekick to 'The Green Hornet'. And I thought he may have left the crime-fighter's employ because he was getting too old for the job. (I also suggested that he was replaced by his own son, Kato.)
But there may have been another reason why Henry had to part company with Britt Reid: I could see the Green Hornet being very rigid and narrow-minded about recreational drug use. Amos Burke, on the other hand, was a member of the elite who believed that anything goes, ushering in the Swinging Sixties. Even though he was a cop, he could have been a bit more tolerant when it came to marijuana.