Earlier this year it took me over a month to get my results back from Blackstone. I suspect the problem was an overzealous local postmaster. Reason? Oh, nothing in particular unless you count her screeching at the top of her lungs, "You wanna send a hazardous material through the mails?!" I pointed out the blanket Blackstone MSDS affixed to the outer package. She then calmed. A little. Next time, UPS.