PHILADELPHIA — A federal judge presiding over the multidistrict litigation in which plaintiffs allege over-the-counter Tylenol led to liver injuries will permit discovery into the compensation paid to witnesses who are executive-­level employees or former executive-level employees of Johnson & Johnson or McNeil PPC.

U.S. District Judge Lawrence Stengel, who is presiding over the MDL with more than 120 cases pending, found on Feb. 26 that the compensation paid to current or former employees was relevant at least to credibility issues.