Drugs used in euthanasia are highly controlled. They are in no way available to the public. Depending on the state and veterinarian's office, the DR may be the only one with access. My clinic only allows the lead tech and the DR on call to access the controlled drugs. Then they must be recorded in a logbook. We keep track of how much we've used and how much we have left so we can account for any if it goes missing. The drugs used in euthanasia in pets can easily kill a human. We regularly have 100lb+ dogs in our clinic.