Color me skeptical...diazepam (valium) when used for seizures is administered orally or by rectal gel. Diazepam auto-injectors are usually used as an antidote for nerve agents (nerve gas) and are administered in the thigh or butt muscle. I don’t see the guy in the photos pulling down Hillary’s pants and sticking her in the butt or thigh while cameras are around as they were in these photos.
https://www.drugs.com/diazepam.html
https://chemm.nlm.nih.gov/antidote_nerveagents.htm
The injector pictured in post #3 says to administer in back muscles of the thigh and can go through several layers of clothing. It also says it is an anti-convulsive drug.