Ok well usps is a GOVERNMENT owned shipping company. Fedex, DHL, and UPS both are in bed with the government but not directly related.
I have had buddies ship rec. substances to friends and family all the time back in the day. And never had a problem. I work in the damage cage at UPS and i once found a protein jug full of an herbal rec. substance. i notified the supervisor and it was simply discarded. No big deal.
Are they just too expensive?