Um, probable cause?

Last November, his lawyer wrote a letter to the FBI. In it, GOP political operative Roger Stone's attorney, Paul Rolf alleged that New York Governor Eliot Spitzer "used the services of high-priced call girls" while in Florida, basing his information on a "social contact."

The letter, dated Nov. 19, said Stone gleaned the information from "a social contact in an adult themed club."

"The governor has paid literally tens of thousands of dollars for these services," Rolf wrote. "It is Mr. Stone's understanding that the governor paid not with credit cards or cash but through some pre-arranged transfer."

It continued, including particular detail -- Stone's lawyer wrote that the governor hadn't taken off his calf-length socks "during the sex act."

It's unclear whether Stone's letter sparked the investigation: court papers say the investigation began "in or about October 2007."

The New York Times reported that law enforcement officials "stumbled upon" the prostitution ring after they'd begun an investigation of Spitzer for potential corruption, after a bank flagged "suspicious transfers."