Also...on that note, mentioning HIMS, and substances. If any of you were not aware:
If you've smoked weed any time within the past 6 months (or a year if you have a pattern of doing so of any kind), you should drop out of the bid NOW and try again next time, assuming at least 6 months to a year has passed. Adjudicative guidelines in the federal government for cleared positions (including this one, which requires secret and therefore an SF-86/eQIP to be filled out) state you generally cannot have used MJ in the past year. This is the case even if you did it overseas or if it is legal in your state, as federally, it's still illegal, and the government doesn't care about foreign sovereignty in this regard. Also lying on the SF-86 is terrible idea, even considering we're not subject to a full SSBI for ATC and it may not be found out. Don't do it, consequences are severe if they do find out.
If you've had more than one DUI in your life, you're probably also out of luck for a clearance and for medical and you should also probably stop illegal downloading if you're doing that and in general be a good citizen. Also, luckily, the FAA should be able to reuse a security clearance from another agency if you already have an active one and it is secret or higher (not guaranteed though).
See here for adjudicative criteria for clearances that are pretty much uniform for jobs requiring a secret clearance or higher if you have any skeletons in your closet otherwise.
http://www.dhra.mil/Portals/52/Documents/perserec/ADR_Version_4.pdf
Also, regarding meds, it is probably very similar to what is approved for pilots. See here for what is ok for pilots.
FAA Accepted Medications – Pilot Medical Solutions – LeftSeat.com