Worried Friend is using- Either Heroin, oxy, Meth

Hi i'm worried my friend is using. she has been addicted to Oxy for about 3-4 years that I know of and stopped and is taking subutex. However not taking it daily. I was wondering if there still is away around subutex? I find razors all around house and her car, she takes a pretty long time in the bathroom as well. I can never tell with pupils are they supposed to be BIG or Small if using? I don't know much about drugs at all, but I have been researching. Can you mix heroin in visine and snort it? I noticed a visine bottle with it looked like nose hairs on the end.
 
If she is really your friend then you should just talk to her about it. I am not going to answer your questions as I dont want to give you ammunition that you may misuse to fuck this girls life up. However I will say that relapse is a part of addiction.
 
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