Posner - Civil Practice / Ethics
Six month delay in withdrawing an element of a complaint repudiated by plaintiff in deposition justified 5K sanction to counsel.
http://media.ca7.uscourts.gov/cgi-bin/rssExec.pl?Submit=Display&Path=Y2015/D12-23/C:15-2011:J:Posner:aut:T:fnOp:N:1676944:S:0
Since 2011. An occasional commonplacing of the U.S. Circuit Courts of Appeal.
Neither an authoritative statement of the law nor legal advice. Quick work.