A lawyer representing a 48-year-old man accused of robbing a downtown Casper bank has requested that his client undergo a mental examination before the case moves forward.

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Prosecutors say Davids Sands entered a Wells Fargo Bank in Casper on July 18 and demanded money from a teller. Authorities have not said whether a weapon was involved or how Sands allegedly made the demand.

He was arrested in Great Falls, Montana in late July.

The Casper Star-Tribune reports that Attorney, James Barrett, made the request for a mental evaluation in federal court last week on behalf of Sands, who has pleaded not guilty to bank robbery by force or violence.

Barrett's motion says Sands, "may not fully understand the nature and consequence of his acts''  and may be mentally impaired.

A trial is tentatively set for October.