Can we clone extinct dinosaurs from DNA?

Paleontologists and molecular biologists have searched for a couple of decades to find and replicate DNA from some non-avian dinosaur fossil. But to date, no results have been obtained, either from fossil bones or teeth preserved in sediments or from a fossil preserved in amber, as was done in the film, Jurassic Park.

To successfully isolate DNA from a long-extinct dinosaur, let alone clone one, scientists would have to overcome numerous serious challenges, including contamination and deterioration of the original DNA.