Federal investigators are going to ask Jose Canseco about the true identity of a steroid dealer identified as “Max” in his latest book on steroids in baseball, Vindicated: Big Names, Big Liars, and the Battle to Save Baseball. Canseco says that baseball player Alex Rodriguez received steroids from “Max” (”Investigators to Ask Canseco: Who Is Max?” April 18).

In the case of Canseco, federal authorities are hoping that his unapologetic use of steroids will lead them not only to Max, but to other suppliers, according to the lawyer familiar with the case, who spoke on condition of anonymity because he was not authorized to discuss the matter publicly.

Canseco’s lawyer, Greg S. Emerson, plans to ask federal authorities for immunity so that Canseco does not risk incriminating himself. If a grand jury convenes in the Roger Clemens’ perjury case, Canseco may be subpoenaed to testify under oath.