stupid question here : why would it have led to a mistrial? if he is the one on trial and he starts running his mouth, its words directly from him. so they can absolutely be used against him (since he said them in court). if he sits there and makes claims (for example) “i was in hawaii at the time” and there are plenty of records to prove he wasn’t in hawaii… that can be used against him … he knows he is under oath and he freely gave the testimony … so it can’t be argued that he was coerced into giving the information…
again… i say stupid question because i’m sure there is a way that it could lead to a mistrial , i just don’t know what it is.