You hear about chickens going via the mail every so often. I think if you sent bees to a prominent government official you'd go to jail as a terrorist. Not sure you could pull an "upskirt" and argue that it was legal and win. But the law would change, and overnight bee farmers who rent hives to orchards would be all but out of business because they use USPS to ship hives.
Legislation is reactionary. Which is why there is so much of it, and why it is often made to protect one group at the expense of others.
Scorpions in the mail seems like a great way to ruin someone's day.