Honey oil made using butane is very powerful. I too would think that the butane wouldn't contaminate the end product. Even if it did, aren't we all inhaling it straight out of the lighter anyway? Maybe the risk of explosion has been responsible for it being labeled dangerous or unsafe? It's also very easy to make which is the only reason I've done it.
Turtle I don't know about putting a few drops on a bowl though. A few drops would be the equivalent of at least a gram of decent weed. I would recommend mixing honey oil made from 1g of weed with 1g of weed and 2 cigs. You'd be surprised what a difference doubling the potency of your mix makes.
Sable, you would know if its honey oil because it would be the stickiest substance you've ever seen/handled in your life. And I bet it could put you in a 'trance with ravings' if you smoke too much. Thatâ??s if your heart doesn't beat its way out of your chest. :)