I was just curious to know if I drank two sips of beer would I pass an EtG test 18 hours later?

Amy,

Here is the problem. One person's sip is another's slurp and a swig is hard to distinguish from a swallow. None of the terms define quantity which determines amount of EtG created.

Why not just sip something non-alcoholic. Sips of beer are no fun anyway.