A friend of mine has been picked up for drink driving, she is sure the
she wasn't over the limit and was wondering if the "Lip Smackers" that
 she uses could have pushed her over the limit as lip smackers
contains Cetyl Acetate, how much alcohol would it contain.

Cetyl Acetate does not contain any alcohol (ethanol) at all.

:-) As2O3

It's possible though that the ester may hydrolyse to give acetic acid
and cetyl alcohol (C16H31OH), which depending on the exact mechanism
of action of the breath test may react in a similar way.

I know in the UK the initial test (the breathalyser) used to use
dichromate crystals which were reduced by ethanol (and in principle
cetyl alcohol could do the same). See eg
<URL:http://science.howstuffworks.com/breathalyzer3.htm>

Stephan

"It's possible though that the ester may hydrolyse to give acetic acid
and cetyl alcohol (C16H31OH), which depending on the exact mechanism
of action of the breath test may react in a similar way."

No! The esther might hydrolyse, but the cetyl alcohol will stay on the
lips. Cetyl alcohol is a solid with a boiling point of 344 deg.
Celcius, so it won't form any vapours that can react in the
breathalyzer.

Sounds like your friend just didn't want to admit that she had been
drinking, unless there was something wrong with the breathalyzer in
the first place.

:-) As2O3