Ever since artist James Sanborn unveiled Kryptos, an outdoor sculpture that sits at CIA headquarters, amateur and professional cryptanalysts have been feverishly attempting to crack the code hidden in its nearly 1800-character message. While they have decoded 3 of the 4 panels of ciphertext in the S-shaped copper artwork, the final panel, known as K4, still defies solution. Only one human being on Earth knows the message of K4: Sanborn. But soon someone else will join the club. Sanborn is putting the answer up for sale.

Raw video: Cuyahoga County Jail security footage shows an inmate attempting to catch marijuana and a cell phone that was dropped from a drone. Earlier this year, we learned that Martin Shkreli, a conman and convicted felon, was secretly running an investment company from prison using a contraband cell phone. Shkreli, also known as the "Pharma Bro," achieved infamy in 2015 for jacking up the price of a medicine needed by a small group of very sick patients to enrich himself and his investors. He was convicted of fraud in 2017 and sent to prison. Prison is supposed to keep criminals out of our communities, but as Shkreli's example shows, contraband cell phones allow inmates to continue their crime sprees from behind bars.