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A Philadelphia university says it's investigating a respected law professor who allegedly emailed students a link to a pornographic video.

Drexel University says professor Lisa McElroy's email last week "erroneously included a link to inappropriate material."

The university says federal law requires it investigate all reports of inappropriate behaviors of a sexual nature.

McElroy did not immediately respond to an email sent to her university account.

The associate professor teaches legal writing and teaching methods at Drexel's Thomas R. Kline School of Law.

She's known for her writings on the U.S. Supreme Court and has written several children's books about the court's justices and other officials.

Drexel says an employee under investigation may be put on administrative leave but wouldn't say if that applies to McElroy.