Non-porous materials

Do you know of any completly, or highly non-porus materials?

I was wondering about how sniffer dogs can smell drugs through plastics, and have heard through "Berry Cooper's Never Get Busted Again" DVD, thats dogs smell through seemingly "impossible" things because of the porousity of the materials. I've also heard that moleclues will go through ANY THING given enough time. Wether this is all true or not I don't know, as I study math.

Is there anything more sutible for wrapping drugs than plastic?

>>9

What you think I'm scum becuase I sell skunk to college kids? Get over yourself. Welcome to capitalism.
Big companies will do whatever they can legally to make more money and get more power. You think they're thinking morrally when they make whole towns unenployed so they can make a bigger profit margin overseas?
Pfft, I'm not doing anything immoral.