Remember Barnett Newman's (1905-1970) "painting" Who's Afraid of Red, Yellow and Blue III? It was damaged in 1986 with an knife. Daniel Goldreyer restored the painting. His restoration caused a big fuss in 1991 because it was very expensive and probably done with a paint roller. The fuss is not over yet because Goldreyer laid a big "image damage" claim. The claim is still not settled by law.
Science can be helpfull on this isue. Why? Because statistical techniques (sparse coding analysis) make it recently possible to quantify the style of an artist. To be short was Who's Afraid of Red, Yellow and Blue III? restored by an paint roller, by Goldreyer himself or ... - who knows? This time statistics will tell.