Anybody can correct me if I'm wrong; but, it seems to me that Amber Heard's team is pissing on their own feet by grilling witnesses about Johnny Depp's drug and alcohol use.
Every witness seems to have given answers that help Depp. "Yeah, he's an adult. He drinks sometimes and so do I." "Yeah, he's a Hollywood liberal. He's done drugs. So have I." "Yes, I've seen him intoxicated. He just got sleepy."
It sounds like Johnny Depp responds to alcohol the same way I always have.
It seems clear that Heard's team was trying to use the drugs and alcohol approach in order to create a narrative that it's plausible that Depp got angry drunk from time to time and assaulted Heard. It doesn't seem to be happening.
Everybody is telling the same story that Depp would anesthetize himself and go to sleep.