The trial of former Massey Energy CEO Don Blankenship goes into its 4th day of testimony today. The prosecution had produced several recorded conversations between Blankenship and assorted individuals speaking of his pay, and profit. In one recording Blankenship establishes that all spending in the company had to be approved by him. Blankenship stands accused of conspiring to break federal mine safety laws at the Upper Big Branch mine in West Virginia, where a coal dust explosion killed 29 miners. The prosecution is arguing that he ignored those regulations to increase profits. If he is convicted he could face 30 years in prison.