But until now, rigorous scientific evidence to support this idea has been lacking.

Everyone's heard about it, but the evidence is lacking.

Patience will be a virtue (though evidence of it is thus far lacking).

Empirical evidence to support either point of view is lacking.

Geological evidence for such an event is thus far lacking.

Lawyers for both sides have said evidence was lacking to charge him.

In a 90-minute session, the court decided that substantial evidence was lacking and abandoned the case.

However, the evidence supporting them lacks quality, so they are not first choice treatments.

The evidence was lacking because the assumption is not true.

It may be so, but convincing evidence for any such policy on Henry's part is unfortunately lacking.