Earlier this week the FBI, in conjunction with the Australian authorities, used an encrypted messaging app to swoop in and arrest more than 800 suspected criminals. On Business Weekly, we look at how they were able to crack global organised crime groups by running their own messaging service, putting it on bespoke phones and handing them out, through undercover officers, to the criminals themselves. We also look at the booming business of ransomware. Hackers are making millions from demanding Bitcoin payments from companies - so how can this new kind of cyberwarfare be stopped? Plus, Turkey says it will no longer accept waste plastic from other countries. So, where will our plastic end up? Business Weekly is produced by Matthew Davies and presented by Lucy Burton.