I've a question regarding ep#18 on Season 9. Title "Finders Keepers".

Remember the part with the herion addicted jogger that broke his shoulder and his girlfriend?? Well, in the scene where the g/f goes out and gets him some herion....is she shooting it in his foot or in her arm?? I just don't get that scene at all. And what happens to them? Does she get arrested??

Thanks so much!