A friend is having trouble with shipping cannabis seeds out of the USA, but it's not a problem for seeds from Europe to be shipped to the USA. What's going on there in the USA? Sudden draconian prohibition?
maybe his address is flagged? so anytime it comes up it automatically gets a security check.
try a false address and deposit mail into a pickup box instead of mailing from home mailbox... might help.
could be bad luck too. Packaging might be a red flag too? e.g. a couple vials in a flat envelope stands out. Could be anything that makes it unique or correlated to illegal shipments.