An internal investigation spells trouble on the tracks for Metro. According to the transit authority's inspector general, employees within Metro's planning department abused agency credit cards to the tune of $10,000 in questionable purchases last year.

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On the list were several Kindle e-readers, a digital photo frame - even a pair of Dr. Dre earbuds for $179.

A glaring example of the alleged abuse surrounds an employee recognition luncheon at an unnamed restaurant for 30 employees.

The bill for food and drinks was more than $14,000, the room cost $150 and tips for the wait staff weighed in at $261.

But the gift list included 49 gift cards, eight gift baskets, six boxes of chocolates, four cutting board sets, two digital cameras, one kindle e-reader and a digital photo album. The grand total: $2,195.

The report detailed trips to grocery and retail stores and revealed a total of four kindle e-readers and more than $2,000 in gift cards are unaccounted for.

According to the report, prosecutors in D.C. declined to press charges, stating: "We are not going to be able to prove this case beyond a reasonable doubt given the culture of credit abuse. They all have something to hide so credibility is an issue."

The head of Metro's planning department said in a statement: "I accepted responsibility for the procurement card irregularities in my area." And the agency said purchase card holders were fired, the agency was fully reimbursed and new controls are in place.