The DL is near impossible to get off flawlessly. If someone knows about it, they will, almost definately see it...
I never have that problem. The double takes work...but there is no way I'd say that its near impossible to get off flawlessly. If you think that, its obvious that you need to take your double back to the drawing room as well...LOL.
Basically, if someone suspects that you are doing a DL (and isn't a magician themselves) then it is because you tipped them off to it somehow. Think about it, if really did just turn over one card in any other trick, do you have everyone constantly saying your turning over two??? No. That's how your double has to look. No one has a reason to even think two cards unless you have given them a reason to think that. Otherwise, all card tricks people would accuse you of turning over two!
If a magician can see it, then why can't a layman who knows that lifting two cards of the deck is often used in magic? You are clearly implying that magicians may suspect you of double lifting, yet you say it can be performed flawlessly. If you think that, its obvious that you need to take your double back to the drawing room as well...LOL.