Actually, he could conceivably be tried of those charges - which is one reason he's probably so reticent to return. Contrary to popular belief, the charges he was initially indicted for haven't yet been dismissed. In a plea agreement, the prosecution will say to the defendant, you plead to X and we will dismiss the other charges after you've been sentenced. Polanski was never sentenced, so the charges were never dismissed.
Also, since Polanski violated his plea agreement when he fled the jurisdiction of the tribunal, the prosecution could then ask the trial judge to vacate the plea, allowing the Prosecution to pursue a conviction on the initial charges. Lastly, because Polanski ran, the statute of limitation has NOT yet expired.
Will that actually happen? It's unlikely, but certainly not impossible.
I wonder if they were able to obtain samples in the day?
If so, this guy could be toast. Her blood would show traces of drugs. His bodily fluids could be on the record too.
I don’t know the particulars, but I’m not sure they did have these things. If they did... ouch for him.
I liked your points. They were good ones. I wouldn’t have thought of what you surmised, but your premise is sound IMO.