On Wednesday, the Federal Trade Commission announced another contest to design a system to “identify unwanted robocalls received on landlines or mobile phones, and block and forward those calls to a honeypot.”

The agency will select “up to five contestants” as part of what it’s calling “Robocalls: Humanity Strikes Back.”

The first qualifying phase launches Wednesday and runs through June 15, 2015 at 10:00pm Eastern Time, while the final phase concludes at DEF CON 23 on August 9, 2015.

The company that pioneered 3-D printed firearms wants to pay $15,000 for a carbon fiber 3-D printer so it can make guns.

In an e-mail to supporters sent Tuesday morning, Cody Wilson, the founder of Defense Distributed, said that he will pay the sum to anyone who can get him the printer. MarkForged, the company behind the Mark One carbon fiber printer, says on its website that its printed parts “are up to 20 times stiffer and 5 times stronger than similar parts 3-D printed using ABS plastic.” The product normally retails for $5,500.

The firm’s offer comes a week after it lambasted FedEx and UPS for refusing to ship its computer numerical controlled mill.

Newly uncovered court documents in a federal armed New Jersey bank robbery case that went to trial in late February 2015 reveal an unusual back-and-forth between authorities and judges—ultimately resulting in the FBI seeking and getting a warrant to use a stingray. The move illustrates a rare known instance where authorities met the probable cause hurdle need for a warrant in a stingray deployment.

In 2012, federal prosecutors went to a judge to ask for a “pen/trap order,” a lower type of permission than a warrant. Such an order would have effectively authorized the use of a stingray. But the judge pushed back and imposed usage restrictions “in a private place.” In January 2015, two United States senators made public the FBI’s position that the agency could use stingrays in public places without a warrant.

Seemingly dissatisfied with this restriction, an FBI agent then took an unusual step—he swore in a new affidavit as part of a warrant application to a different judge for permission to deploy “mobile equipment.” Such gear would enable the FBI “to monitor the dialing, routing, addressing, and signaling information of the Target Facility in order to determine its general location for a period of 30 days beginning within 14 days of the date of the warrant.” The second judge, United States Magistrate Judge Mark Falk, signed off on the search warrant absent other limits.