I used to work in my downtown and I would regularly run into a guy who would push around an empty wheelchair most days. Some days though he would be sitting in

I used to work in my downtown and I would regularly run into a guy who would push around an empty wheelchair most days. Some days though he would be sitting in it. I asked him about it, and he said he did drug and medicine trials, and some days he couldn't walk because of them so he would need the wheelchair to move around. No idea how truthful he was because I don't know how that stuff works here in Canada (and this was years and years ago too) but he came to mind after reading this article.