I have pick pocketed Drizzt in each of the games I have played until now. Sometimes with as low as 35% in PP. I have done it in both TotSC with the latest patch installed AND in DSotSC with the Harder MOD installed. I always wait with the pick pocketing until Drizzt has killed all the enemies in the area - I do not know if that would make any difference though.
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Insane
BTW: Get a surprise: Try to kill Drizzt with the DSotSC MOD installed