What is the name of the movie about twin brothers, where one is unable to continue on with his career (somethi?

ng scientific - I think) and so sends the other in his stead? I believe it takes place in the future and someone finds out about the deception; using some type of technology attempts to reveal the truth. I vaguely recall this movie, so I believe it is several years old at least. I'll update with any further details, if they should surface. This movie has been tickling and nagging at me for a while now, so any suggestions are greatly appreciated.