One thing that the NASCAR community wondered after the announcement of Denny Hamlin and Kyle Busch failing the post-race inspection test was how come their cars passed the pre-race inspection in the first place. Journalist Kelly Crandall was quick to come up with an explanation for this. Let's take a look at what the reason is, according to Crandall.
What many fails to realise, simply because of lack of knowledge, is that the process of pre-race testing and post-race testing are very different. And that in pre-race, NASCAR’s hands are tied in terms of what they can do with the cars.
Kelly Crandall tweeted the explaination for this on her twitter.