Nukes: Nope.

Chemical weapons: Possibly. Possibly not. He had them. He used them. Whether he has old ones still around or whether he's managed to hide new ones is something the inspectors will have to determine. He has the knowledge of how to create them. All he needs are the facilities and chemicals. He might have a couple kilos of chem agents still. These would be easy to hide and hard to find. But they would also make an ineffective weapon. For a weapon system, he needs a lot more.

Bio weapons: He probably has samples of strains. Whether he's managed to cultivate them needs to be determined by the inspectors. Same as with the chem agents. Having a culture growing in a jug won't do much as a weapon. But it will be easy to hide and hard to find.