state police (civilian labor)

[forsci]

I was wondering if anyone could help me.  I have never had to deal with any of these issues.  I am applying to work in a state police crime lab as a forensic scientist.  I am qualified, but I am nervous about the poly test.  I have read and re-read the guide on this site but I have drug use in my history (weed, although recently clean).  I am wondering how in depth this poly will be.  It seems to me that polygraphs for civilian positions would be less painful.  

Another issue: I am reading many posts that people exaggereated their responses to the controls and failed.

HELP!

thanx

[forsci]

Oh yes,

another issue.  my credit is nothing to brag about.  These issues are sounding very ominous to me but I really am an intuitive scientist.  I'm just inexperienced working with any law enforcement agency.  

thanx again,
worried