The US Secret Service has raided the home of an artist who collected images from webcams in a New York Apple store.
Kyle McDonald is said to have installed software that photographed people looking at laptops then uploaded the pictures to a website.
Mr McDonald said he had obtained permission from a security guard to take photos inside the store.
Apple declined to comment. However, the Secret Service confirmed that its electronic crime division was involved.
A spokesperson told the BBC that the investigation was taking place under US Code Title 18 /1030 which relates to "Fraud and related activity in connection with computers."
Offences covered by the legislation carry a maximum penalty of 20 years in prison.
Writing on Twitter, Mr McDonald said: "@secretservice just stopped by to investigate [web address removed] and took my laptop. Please assume they're reading any e-mails you send me."
No arrests had been made in the case as of 8 July.
Staring
Kyle McDonald's images were uploaded to a page on the blogging site Tumblr.
In the description of People Staring at Computers, the project is described as: "A photographic intervention. Custom app installed around NYC, taking a picture every minute and uploading it if a face is found in the image.
"Exhibited on site with a remotely triggered app that displayed the photos full screen on every available computer."
The site features a video and series of photographs, apparently showing shoppers trying-out computers.
Comments on the individuals by visitors to the site are also attached to the images.
Mr McDonald, writing on Twitter, said that he had been advised not to comment on the case by the online freedom group the Internet Frontier Foundation.
8 July 2011Last updated at 02:46 ETBy Iolo ap DafyddBBC Wales environment correspondent
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The large-scale companies won't be able to make the profit they have been"
End QuoteDr Owen GuySwansea University
"There was no bank financing available. I then had to take a total act of faith and said 'okay, we will halve the scheme, we will do one megawatt initially' and I basically raided my pension fund."
Other applications for three and five megawatt solar parks at Cynheidre and Ffos Las in west Wales are said to be still in planning.
But while Rhosygilwen has beaten the government's closing of a lucrative loophole, developers like Nigel Payne of Allied Renewables in Swansea are setting their sights lower.
His company hopes to complete three 50 kilowatt solar parks, half the size of Rhosygilwen, by September.
Expansion concern
Another ten are in the planning stage and, by reducing the size of the output, will still be able to generate a return of 30.7p per kilowatt hour.
"It spreads the fund in tariff to what it was designed for - not supporting large-scale solar farms where subsidies would be absolutely gobbled up," he said.
The Department of Energy and Climate Change has said from 1 August tariffs would be reduced for large solar panel investors.
Any large-scale solar farms above 250 kilowatts, and up to 5 megawatts, will be able to claim 8.5p per kilowatt hour.
Schemes between 150 kilowatts and 250 kilowatts will be able to claim 15p per kilowatt hour and schemes ranging from 50 kilowatts to 150 kilowatts 19p per kilowatt hour.
Solar installations below 50 kilowatts are unchanged.
The average household installation, less than 4 kilowatts, will still be claiming the highest bracket of 43.3p per kilowatt hour.
With the solar industry increasing over the past 12 months from generating 4 megawatt of power in Britain to 96 megawatts, Dr Owen Guy, Swansea University's senior lecturer in nano technology, said there were some concerns that expansion could slow down.
"It's still available for the small-scale projects. Individuals will be able to install four kilowatt systems on their homes and will still be able to get a good return on their investment," he said.
"But the large scale companies wont be able to make the profit they have been."