Madam Chair, I'm a lawyer by background. Intelligence is not evidence; it's information. You can give it some more credibility by collecting more information by using other sources and technical methods to confirm the information. At the end of the day, intelligence is simply information you've received of whatever credibility you can attach to it.
In the case of intelligence services, we probably have better means of confirming that information than do, say, the news media when trying to confirm their intelligence, but in some senses we're very similar. We're dealing with information that is unproven until we can add some more credibility.