To keep things in perspective:
158.4 billion total pieces of mail moved through the US mail system in 2013.
11,580 pieces were seized by postal inspectors as drug-related in 2013.
Rougly one of every 13.6 million pieces of mail is seized as drug-related.
79% of all seized parcels contained marijuana.
2011 seizures: 5,908; 2012 seizures: 9,640; 2013 seizures: 11,580
Do the math. Understand the odds. Relax.
Maintain good OPSEC anyway.
Sources:
https://about.usps.com/who-we-are/postal-facts/decade-of-facts-and-figures.htm
Edit: I deleted two incorrect statistics. Yes, it would certainly be far more helpful to know the total number of parcels mailed containing drugs and use that to calculate the seizure rate of drug-containing parcels. But there's no reliable data that I've found. The fact that it's so easy to create a parcel containing drugs which is virtually identical to "normal shit" and blend in with the millions of other pieces of mail means that using the total mail volume is a reasonable (though obviously not exact) calculation of the odds for relatively standard envelope mail.
The further away from a piece of "normal mail" (standard size flat business envelope, sent domestic, first class) you get, the less reliable the odds would get. All kinds of factors like product odor, size of parcel, destination, origin, international or domestic, etc., would determine how far away from the given odds that particular piece of mail would rate.
I think it's safe to say that a standard envelope that appears like an average piece of junk mail containing a small amount of odorless drug would likely have the same rough odds as stated above.
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