According to various news reports, US law enforcement first became aware of New York Governor Elliot Spitzer because of suspicious financial transactions, and not because they were already monitoring the escort service Emperor’s Club VIP.

First, from ABC News:

The federal investigation of a New York prostitution ring was triggered by Gov. Eliot Spitzer’s suspicious money transfers, initially leading agents to believe Spitzer was hiding bribes, according to federal officials.

It was only months later that the IRS and the FBI determined that Spitzer wasn’t hiding bribes but payments to a company called QAT, what prosecutors say is a prostitution operation operating under the name of the Emperors Club.

Spitzer was paying for his prostitutes by sending money to shell companies that existed in name only.

From the New York Times:

The money ended up in the bank accounts of what appeared to be shell companies, corporations that essentially had no real business.

The transactions, officials said, suggested possible financial crimes — maybe bribery, political corruption, or something inappropriate involving campaign finance. Prostitution, they said, was the furthest thing from the minds of the investigators.

Only after investigating where the money was being sent to did the Feds realize what it was that they were dealing with.

But before long, the investigators learned that the money was being moved to pay for sex and that the transactions were being manipulated to conceal Mr. Spitzer’s connection to payments for meetings with prostitutes, the official said.

Then, with the assistance of a confidential informant, a young woman who had worked previously as a prostitute for the Emperor’s Club V.I.P., the escort service that Mr. Spitzer was believed to be using, the investigators were able to get a judge to approve wiretaps on the cellphones of some of those suspected of involvement in the escort service.

The wiretaps, along with the records of bank accounts held in the names of the shell companies, revealed a world of prostitutes catering to wealthy men. At the center was the Emperor’s Club, which arranged “dates” with more than 50 beautiful young women in New York, Paris, London, Miami and Washington.

But its finances moved through the shell companies — the QAT Consulting Group, QAT International and Protech Consulting — which held bank accounts into which clients wired their payments, according to court papers in the case.

Read the entire text of the complaint here.(PDF)