U.S. investigators will examine actor Sean Penn's interactions with Joaquin "El Chapo" Guzman, two U.S. government sources said on Monday, but it is unclear if prosecutors would try to force the actor to turn over information about his interview with the recaptured drug kingpin. Actor Sean Penn shakes hands with Mexican drug lord Joaquin "Chapo" Guzman in Mexico, in this undated Rolling Stone handout photo obtained by Reuters on January 10, 2016.