Why do people try and bring drugs to the airport knowing they have to get past security?

 The 48-year-old Phillips was heading to New York when she failed to pass a security screening and a secondary search turned up a small amount of cocaine and heroin in her possession, he said.

http://ap.google.com/article/ALeqM5izlVBQ6sRHw7fv-X_aWr-ayehTNQD92QR79O3