The TWICE Act requires the Transportation Security Administration to develop guidelines within one year to improve access to the Transportation Worker Identification Credential program, commonly known as TWIC. The bill specifically directs the TSA to create guidelines that help returning citizens who have been incarcerated access the program, assist currently incarcerated individuals in preparing applications, and help people appeal or request waivers if they've been initially deemed ineligible. The legislation does not authorize specific funding but requires the TSA to brief Congress within 180 days after the guidelines are developed to explain how they are being implemented. The bill affects formerly and currently incarcerated workers seeking credentials needed for transportation security positions, as well as port and transportation facility workers in general who rely on the TWIC program.