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By JENNA FRYER AP Auto Racing Writer CHARLOTTE, N.C. (AP) Nascar has asked a federal judge to order a mental and physical examination on suspended driver Jeremy Mayfield to determine if he has a substance-abuse problem.

NASCAR also wants to know if Mayfield suffers from attention-deficit hyperactivity disorder, as he claims.

Monday's filing includes three affidavits and a deposition from four different people who claim to have witnessed Mayfield using methamphetamines multiple times since 1999.

Mayfield has been suspended for failing a random drug test collected May 1. NASCAR has said he twice tested positive for methamphetamines, but Mayfield has denied using the illegal drug.

(Copyright 2009 by The Associated Press. All Rights Reserved.) APNP 09-21-09 1759CDT | save this article / add to your favorites list