Semantics. Serino knew of no video, but told Zimmerman there was “a possibility” in order to elicit a response. That’s a lie, a kind one can expect in a police “interview.”
In this instance it was a lie. He wasn’t talking about the possibility that some video camera somewhere in the complex had recorded it, he was saying that it might be on TM’s phone, which he ominously placed on the table:
“And one of his hobbies happens to be the videotaping of everything he does. OK. He has, has a library, very impressive, going through his phone, we got a little bit, but the battery died. We’re still working on that. There’s a possibility that whatever happened between you and him is caught on videotape. And this is going to be our final interview. I’m not gonna talk to you any more after this. We’re good, you know what I’m saying? That right there, that’s his cell phone.”
https://www.txantimedia.com/?p=1025
He knew there was no video. At best, he had no idea whatsoever whether there was video on there or not. That’s a lie, in the same way that I might tug on a your sleeve at the bar and say there’s a “possibility” that your wife is cheating on you — but to protect other people I really shouldn’t tell you why I think that. (Pretending that they couldn’t read the phone’s memory because the battery was dead is another obvious lie. You usually don’t even need the phone to read the phone’s memory card.) He was just guessing — hoping would be a more correct word — that GZ was telling some lie about what had happened.
Under cross examination, O’Mara asked him, “You lied, right, told Zim you found camera footage of that night...?” Serino does not deny that it was a lie.