Kait, please continue to be very careful for a few more days, there are some sedatives out there that can last at low levels for days (namely anti psychotics that are not legaly approved for horses). I'm not saying yours is doped but it is not unheard of. Just be careful.
Hopefuly you have found a gem though.
What diseases do you have over there that require a 30 day quarenteen? Strangles only requires a 14 day quarenteen with the vast majority of cases showing signs within 5 days of contraction the disease.
On the quarantine side of the property we sign in and out, step into bleach baths, going in and out, sanitize our hands and change clothes before moving over to the non-quarantine side. I keep our quarantine barn up to USDA standards for importing and exporting horses. It has saved my bacon more than once. This summer being the most recent when, due to drought, we had an explosion in this state of dryland distemper or Pigeon Fever. I had a horse come down with it, quarantined her and no one else on the property got sick.