你怎知车主没撒谎？只要车主没报警报失那就不在被偷的范围。你不懂，否则每个车主都可在借车出事后说没同意借了

 车主说认识这人，说明这人是车主的朋友，不管车主承不承认借，都会被认为是同意借的。 一般来说车主的亲属朋友同事等开车主的车，不管车主同意与否都会被认为是经过车主同意的了。给你一段我从网上拷下来的对车主同意的定义：
“A trier of fact is allowed to consider the relationship between the owner and driver when direct evidence of permission (also known as “explicit permission”) is in dispute. It certainly appears more likely that permission was granted if the owner and driver are married, close friends,  or had an employer/employee relationship. A trier of fact is allowed to reasonably conclude that permission was granted even if the owner denies it and there is no direct evidence that permission was specifically given prior to the accident. This is called “implied permission,” in that it can be implied, perhaps due to the relationship or prior interactions between the parties, that permission was given, even though it wasn’t specifically stated.”http://www.stevendhillonlaw.com/home/vehicle-owners-liability-following-a-car-accident-identity-and-permission/