TULSA, Oklahoma - The U.S. postal inspector confiscated a package from the mail Friday that contained dozens of wrapped packages of meth, weighing one ounce each, totaling four pounds. The postal inspector said the drugs are worth between $80,000 and $100,000.

The U.S. postal inspector doesn't want to say exactly how they know which packages contain drugs, but, when they opened the package on Friday, they found more than four pounds of meth.

Tulsa's postal inspector works undercover and said he finds packages containing drugs every single day, sometimes more than once a day.

He said it doesn't matter how creative people get with the packaging, or trying to mask the odors, it doesn't fool the drug dogs.

"Whether it's sealed in a jar, or factory sealed in a can, masked with pungent odors, the dogs hit on it instantly," said U.S. Postal Inspector Al Chapa.

Tulsa K-9 office, Buster, and his handler, Officer David Wamsley, are some of the best in the business. In a demonstration, Buster was able to find a package of marijuana hidden in an office. Once he found it, he gave his trademark scratch on the box, and got his reward.

Marijuana is by far the most common drug sent through the U.S. mail and accounts for nearly 70 percent of all mail drug seizures. In 2013, the post office found 45,000 pounds of pot in more than 9,000 packages.

Most of what comes into Oklahoma is from Colorado, California, Arizona and Illinois; Colorado is now number one.

"Individuals seem to think, because it's legal in Colorado, they can send it to their buddies and friends; everybody wants to get in on the business. Unfortunately, any time you put it in the U.S. mail, whether it's interstate or intrastate, it's still a federal violation," Chapa said.

The penalty for mailing drugs through the U.S. Postal Service could be years in a federal prison.