In this case, you have overwhelming evidence of efficacy.

The evidence was overwhelming,

The evidence in this case is truly overwhelming and the murders were senseless and very brutal and Mr. Williams should pay the ultimate penalty for his crimes.

(We) found very little evidence for the efficacy of these over-the-counter cough preparations for cough due to the common cold.

That guy's evidence - and his case - was toast,

That was the strongest evidence in the case.