UPS can be searched by Feds or State troopers or police at anytime "Random Search" and they do it all the time. The Post office cannot be searched like this and you need a damn good reason to ask for permission to do so, they have postal inspectors for that.
Police train dogs often at their own homes and I will tell you that they also train these dogs to sniff Money. When you send funds in the mail do not ever use UPS as they take dogs in with them when they do random searches.
I was busted years ago because dogs smelled HGH I had shipped UPS to me domestically. They smelled methanol or methol its a substance in the HGH to dry it I think. They made a controlled delivery arrested and raided me and then used my shit they stole. It is cool though they helped me out by just charging me on possession when they easily could have put distribution when they found 400 vials of tornell in my house. They know my face from the local gym and were happy to stock up on my goods and just not claim they ever found it and put it in the trunk of the car. Shoot, I would do the same it benefits us both..lol.. I saw the troopers at my gym 4 months later and they were looking pretty big but if they were using Nutri-Vet they would be bigger
UPS is private owned so to speak not governmently controlled. Correct me if I am wrong because I may be but I think thats why they are so vulnerable to random searches and basically flat out stealing in some cases. In my home town the Police were doing random searches and they were stealing valuable items while opening these packages. They cought them on tape but they were never fully prosecuted.
Guys just stay away from UPS.