You can read the agreement here. (it is at the end)
The immunity agreement is specifically for charges relating to the disposal of her body and/or evidence related to that. In addition, they would grant him immunity for drug related charges, and any perjury charges that might arise from his statements.
The agreement was conditional on them finding evidence where he said they would.
The agreement did not grant him immunity from any other charges that might arise in the case, provided that those charges were based on sources other than himself.
If they in fact found evidence from other sources that implicated him in something beyond disposal of the body, they would not be bound by the agreement on those things. They would not need to retract the immunity offer in that situation, because it clearly excludes that. Immunity would remain - but only for the body disposal/tampering with evidence charges, not anything else he might have done.
If they are now trying to retract the deal, it is the deal on the agreed upon cases, namely disposal of the body and some other drug related charges. The only way they can do that is if they did not find the specified evidence where he said they would. If they subsequently found other independent information that would have led them to the same disposal site, it does not matter, the immunity deal would still be in place.
The immunity agreement is specifically for charges relating to the disposal of her body and/or evidence related to that. In addition, they would grant him immunity for drug related charges, and any perjury charges that might arise from his statements.
The agreement was conditional on them finding evidence where he said they would.
The agreement did not grant him immunity from any other charges that might arise in the case, provided that those charges were based on sources other than himself.
If they in fact found evidence from other sources that implicated him in something beyond disposal of the body, they would not be bound by the agreement on those things. They would not need to retract the immunity offer in that situation, because it clearly excludes that. Immunity would remain - but only for the body disposal/tampering with evidence charges, not anything else he might have done.
If they are now trying to retract the deal, it is the deal on the agreed upon cases, namely disposal of the body and some other drug related charges. The only way they can do that is if they did not find the specified evidence where he said they would. If they subsequently found other independent information that would have led them to the same disposal site, it does not matter, the immunity deal would still be in place.