FYI, diazepam is basically impossible to inject. It's water solubility is well under 1mg per ml, not much better in ethanol, an anyone with a tolerance needs a high enough dose they would need 3ml syringes and the proper solvent.
Besides, diazepam has a very fast onset, Tmax of 1-1.5h, injecting simply offers no benefit. And of course almost complete absorption.
This was an old thread anyway, it should not have been revived.
And K is right, please don't swim here, and that isn't really a request. Take responsibility for your own drug use/other actions, real or hypothotical. You really think they are gonna prosecute this mysterious "SWIM" or your pet cat? No.
It's annoying, and offers no protection. Please and thank you.