Investigations over Google's Wi-Fi data collection admission continued Thursday when Connecticut Attorney General Richard Blumenthal penned a letter to the search engine giant asking for specific information about how the data was collected.

Blumenthal said 38 other state attorneys general and the District of Columbia have joined him on the letter.

"Google's responses continue to generate more questions than they answer," Blumenthal said in a statement.

Specifically, Blumenthal wants to know if Google has used or sold any of the information it collected, whether Google tested the software before using it, who designed the faulty software, and specific locations where data was collected.

"We will take all appropriate steps – including potential legal action if warranted – to obtain complete, comprehensive answers," Blumenthal said.

The issue dates back to May, when Google admitted that Wi-Fi data collection devices attached to its Street View vehicles inadvertently collected data being transmitted over unencrypted networks. A subsequent Stroz Friedberg audit of the source code collected by Google could not determine whether personal information was collected. Google later said that the data was only accessed twice: when the individual engineer who designed the software first created it, and after the glitch was discovered and a security engineer tested the data to verify that this was the case.

"As we've said before, it was a mistake for us to include code in our software that collected payload data, but we believe we did nothing illegal," a Google spokeswoman said. "We're working with the relevant authorities to answer their questions and concerns."

Google said it has agreed to hand over collected data to German, French and Spanish data protection authorities. Google has already destroyed data collected in Ireland, Denmark, and Austria. Italian, Canadian, and Australian officials are also investigating.

In the wake of the controversy, Google grounded its Street View fleet, but said in July that it had resumed Street View data collection in Ireland, Norway, South Africa, and Sweden.

Thursday's letter is part of a multi-state initiative Blumenthal announced in late June. The attorney general said 38 states and D.C. have since joined that effort, including New York, Mississippi, Vermont, Nebraska, North Carolina, Oregon, Washington, Kansas, Montana, and Rhode Island. Seven states are on the executive committee, including Florida, Illinois, Kentucky, Massachusetts, Missouri, and Texas. Eight states have declined to be publicly identified because their laws or procedures prohibit disclosure of investigations, Blumenthal said.

Blumenthal is currently running for the Connecticut Senate seat being vacated by departing Sen. Christopher Dodd. He has also been vocal in his opposition to the adult content allowed on Craigslist.