Restrictive Confinement of Youths Act of 2020 or the MERCY Act . 11402. Juvenile solitary confinement (a) In general Chapter 403 of title 18, United States Code, is amended by adding at the end the following: 5043. Juvenile solitary confinement (a) Definitions In this section— (1) the term covered juvenile means— (A) a juvenile who— (i) is being proceeded against under this chapter for an alleged act of juvenile delinquency