If there is evidence, hard evidence and not just the words from an oral history project, it should acted upon. If there was I'd assume that it would have surfaced before now.

If there is no such evidence, and from the news I've read there seems not to be, there is no reason to hold Adams.

In an oral history project anything can be said. I'm going to admit to killing Lincoln and have a "fling" with Queen Victoria before she married dull ol' Albert; that's why she let me sneak into Windsor Palace at night: I actually fathered all of her children. And I ordered the St. Valentine's Day rub-out in Chicago.

Facts do not (usually) concern an oral history project.