Slipping someone a drug has the added benefit of not having your face scratched off when you are choking someone, maybe this is why he also prefers short victims? If his arms are much longer than hers, she can't attack his face.
Being a fairly technical person myself, which probably makes me bias in this response, I haven't seen any evidence what so ever, or any reason to believe the perp has strong technology skills. Most everyone in black market biz uses burn phones, that doesn't make them tech savy. I think most people on ws suffer from bias due to media reporting and hollywood glorification of hacking or technology. I dont watch tv shows but I do know the crime shows love this topic. I have seen no evidence of above average technical ability: he can browse the internet and use a prepaid phone. That is all we have. And given that he has been picking up street walkers in 2000, 2003, and 2006 in AC (if), I have to say he is likely much older and didnt become wise to the nets anonymity until the first G4, pretty late in my opinion. Moreover, making anon fone calls from time square and penn station lets me know he is no techy, no hacker, and likely learned his "tech skills" from poorly written television programs.
