he will expect it to be carried out without question.
Court cant order someone to do the impossible thing. Even if the court ordered experts to do that, still it is not possible to be carried out unless you control it but it cant be controlled.Tainted or not, it doesnt matter at all as it is still the same coins that could be used to make some payment or even to be exchanged
Except that it is not impossible, just very, very difficult.
And again, you're talking like coins are real. If there is an account with 99 coins and someone sends a "tainted" coin to it, it the account and every coin spent from then on tainted? Or it is 1% tainted? Are all spent coins from then on 1%? Or just the first coin? Or perhaps the last?
If I have a tainted account and I send 100,000 satochis to 100,000 other accounts, are they all tainted? (In today's market, that's about 0.40 USD.)
The specific coins are the tainted coins as far as I know. Otherwise people could taint every coin in existance, basically making the tainting useless.
Tainted coins could in theory be a problem if miners start to reject transactions that cointain tainted coins. This is very unlikely to happen, unless they were stolen for istance from the mining pool itself.