Sanctions for lawyers of witness who perjures himself?

Eric Turkewitz continues his coverage of a developing story in New York, where a judge recently found a physician who has made a career testifying for defendants in personal injury cases in New York has been found to have committed perjury.  Go here for the first installment on the story. Go here for the latest.  Should the lawyers who brought the witness to testify be sanctioned?   The judge initially imposed sanctions but then eliminated them. 

The case also involves an attorney surreptitiously obtaining evidence to expose the perjury.  Should that evidence have been turned over as part of discovery?