President Barack Obama said Monday he will ban the use of solitary confinement for juvenile and low-level offenders in federal prisons, citing the potential for "devastating, lasting psychological consequences" from the use of the isolation as punishment. "It has been linked to depression, alienation, withdrawal, a reduced ability to interact with others and the potential for violent behavior," Obama wrote in an op-ed posted Monday evening on The Washington Post's website. "Some studies indicate that it can worsen existing mental illnesses and even trigger new ones. Prisoners in solitary are more likely to commit suicide, especially juveniles and people with...