This was a common practice years ago.Many drivers qualified neighbors or relatives to act as their co driver but ran the whole trip alone. One time there was an accident in Texas where the driver was in a coma and the Texas State Troopers spent about 20 hours looking for the so called co driver. After that incident Roberts cracked down and would always ask to speak to the co driver and wanted personal info from that person,such as birth date, home zip code,etc. This seems to have gone away as the Co Driver is then put on duty to answer the questions. One guy I knew (before caller ID) would call his hiome on a 3 way call,his wife would then call dispatch and both so called drivers could be verififed.
This too me is playing with fire big time,if you had an accident and it was proved that you lied about the co driver not only would you lose your contract,the insurance company might not pay up. I met a guy from Boston once who drove straight thru from Mass to Phoenix.He said he was hallucinating when he got there. He had qualifed his neighbor who was a Russian imigrant, and when dispatch wanted to speak to Borris,he would wait an minute then come back on the phone with a strong Russian accent acting like he was Boris.Also if the DOT stopped you there could be some difficult explaing to do unless you were running several logs. Not worth it in my opinion,you could wind up in big trouble ,if something went wrong..