after the 60s pop group the Kingsmen had a top 10 hit with the song "LOUIE LOUIE", the FBI spent 2 years investigating the lyrics. they played the record foward and backward at 33, 45 and 78 rpm. they found the lyrics to be unintelligible at any speed.
perhaps the FBI should have just sent two of their youngest blond female agents to take Chuck Berry out to a nice memphis bbq dinner with plenty of new orleans' Albita beer. after all he wrote the song and it would have been much cheaper than all that lab work.