i'm an a recovering addict of 3 plus years, cocaine and then crack.
cocaine drug use in it's early stages is extremely easy to hide. has no smell and it's controllable for the most part. if you got smart, you can take some nasal spray and put about a gram in it, shake it up, and you could have a runny nose all day long
and no one would know.
the easiest and quickest way to tell if someone is lying is very simple and straightfoward... go to wal greens or wal mart and buy a 15 dollar drug test and pop it on them. that will cut the BS right then and there. if they wont' take the test they are BSing you. About a year ago I had a similar situtation that I actually posted in this very forum if some of you remember.. my GF now had left a rolled up dollar bill with cocaine residue on it.. she told me she used a couple of itmes with her old roomate but that she wasn't really into it and stopped. and i'll be damned if she wasn't right. so don't jump to conlusions all the time. I told her I would give her drug test a couple randomly though the year, not becuase I don't trust her, but because I really, really cannot be around someone using, espicallysomeone now living with me. it was more about me than her. passed them all with flying colors. she even had the nerve to give me one a couple of months ago when I came home late! (hey..sometimes you really DO get lost on the way home.. iwas on the phone, made a couple of turns not paying attention to where I was and ended up in a part of the city I had no idea where I was, i'm not from here)
anyway, symptoms are figitiyness, hyper activity, it's an stimulant remember.
when it gets worse, the ability to NEVER keep any amount of money, always borrowing money, they don't keep themselves as groomed as they used to, weight loss
cocaine itself is not the worst thing on earth. it's not great, but if I could have kept my addiction at cocaine... yes you want to get off of it, but there are worst drugs to be addicted to, trust me. you want to stop her before it's too late becuase once you realize that you can get higher, faster, cheaper smoking crack.. the game is over. I consider myself very lucky to be drug free.. becuase i Know alot of people who are still using ,and alot of people who have died becuase of crack.
any more advice/help you need just let me know