An Ohio company has embedded silicon chips in two of its employees - the first known case in which US workers have been “tagged” electronically as a way of identifying them. CityWatcher.com, a private video surveillance company, said it was testing the technology as a way of controlling access to a room where it holds security video footage for government agencies and the police. Embedding slivers of silicon in workers is likely to add to the controversy over RFID technology, widely seen as one of the next big growth industries. RFID chips – inexpensive radio transmitters that give off a...