Hi Answers crew. I want to know if the handheld type of metal detectors used to find coins, jewelry, and watches can effectively find a 3/4 inch copper water line buried in my front yard suppling water approximately 18 inches below some fairly rocky soil. If I can locate the pipe I can avoid spending $325 for a leak locater service. If this is possible can these be rented? Thanks in advance.

Because if they're only metal detectors, then wouldn't it be really really easy to smuggle drugs onto planes? I mean you could just have a little baggie of the drug of choice in your waistband or bra or something and the detector wouldn't be able to tell, right? Or what if you have a shard of glass somewhere in your clothes, it wouldn't be able to detect that either, yet that could do just as much damage as a knife. So what's stopping people from bringing drugs onto planes? Don't trip, I'm not planning on smuggling crack onto a plane or anything, I was just wondering.

I have a small surgical steel piercing, and I'm curious if it would set off the metal detectors at an airport.

I just got my septum pierced without my parents knowledge. I simply wear it up when they're around, so all is good. However, I will be traveling with them in the next 2-3 weeks, and I'm wondering whether or not I should take it out just before we pass security, and put it in after we pass through, or to chance the metal detectors.