Today’s BLOG deals with the “Relation Back Doctrine” (the “Doctrine”), which, inter alia, “allows a claim asserted against a defendant in an amended filing to relate back to claims previously asserted against a codefendant for Statute of Limitations purposes where the two defendants are “‘united in interest.’"”

Under the relation-back doctrine, new parties may be joined as defendants in a previously commenced action, after the statute of limitations has expired on the claims against them. The doctrine is codified in CPLR 203.