HELP on Unsolved Crimes FILE 09 BLACKOUT

I'm stuck on file 09(the blackout), the one where a girl is dead in a hotel room. I can't get pass to the query part about who's lying. I found 2 people that are lying but I cannot find evidence to prove those 2 people are lying. If anyone pass this, Please tell me!! Thanks

you can go to gamefaqs.com and search unsolved crimes and you'll get a walkthrough