Apparently eating a napkin with incriminating evidence written on it is not enough to ward off insider trading charges.

In the latest probe to touch an Am Law 100 firm, the U.S. Securities and Exchange Commission and federal prosecutors in New Jersey have charged Steven Metro, a managing clerk at Simpson Thacher & Bartlett in New York, and Morgan Stanley stockbroker Vladimir Eydelman with taking part in an insider trading scheme that netted $5.6 million in illicit profits.