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There he is getting picked up. but look here, nearly an hour later, there he is again getting dropped off at his car. he opens the driver's door and throws a box of light bulbs onto the front seat. ross never told detectives about going back to his car in the middle of the day. did he lie about going to the car or did he just not disclose that he had gone to the car? >> i think when you look at it in totality, he absolutely lied about it. >> reporter: investigators were sure ross was hiding something. they believed there was no way he could have opened that door and missed his son in the back ...

Wouldn't be able to forget something so fast? >> this is something that if you look at it alone, can somebody forget something that fast? is it possible? yes. but then you look at the location of the car seat and all of the other factors together and that showed us that he could not have. >> reporter: investigators noted that cooper's car seat was just inches from the driver's seat. and when they looked at surveillance video from ross' work parking lot, they saw this, video of ross backing up before he parked. they were sure ross must have seen cooper when he backed up. we wanted to see for ou...

We're in the same type of car ross harris was driving. we placed the same model of car seat in the same spot cooper was sitting. if i turn around i can definitely see it. if i use my mirrors to back up, i can't. >> and there was another detail the surveillance video from home depot reveal. ross had gone to lunch with some friends. there he is getting picked uhm. but look here, nearly an hour later there he is again getting dropped off at his car. he opens the driver's door and throws a box of light bulbs on to the front seat. ross never told detectives about going back to his car in the middle...

Now, i don't know what was going through this man's mind, but i do know i have five children and i forget things in an instant. it just happens. is it fair that -- to say, oh, he wouldn't be able to forget something so fast? >> this is something that if you look at it alone, can somebody forget something that fast, is it possible? yes. but then you look at the location of the car seat and all of the other factors together, and that showed us that he could not have. >> investigators noted that cooper's car seat was just inches from the driver's seat, and when they looked at surveillance video f...

Now, i don't know what was going through this man's mind, but i do know i have five children and i forget things in an instant. it just happens. is it fair that -- to say, oh, he wouldn't be able to forget something so fast? >> this is something that if you look at it alone, can somebody forget something that fast, is it possible? yes. but then you look at the location of the car seat and all of the other factors together, and that showed us that he could not have. >> investigators noted that coopers' car seat was just inches from the driver's seat, and when they looked at surveillance video f...