Hmmm..not so sure about 'dat.
The suitcase nuke situation has been pretty extensively documented, by some pretty respected/smart people.
There's been Congressional testimony, CIA analysis, documentation up the "ying yang" that the "suitcase" (ie: tactical) nuke was developed by both the US & USSR.
Many are missing from the USSR (as explained by defecting USSR General Lebed, who "mysteriously" died in a 'copter crash shortly after testifying to this fact before Congress).
As someone else said..where did they go? Money can buy just about anything - and AQ/Osama reportedly have BILLIONS from their drug trafficking.
I for one think they probably have them. The real question becomes..have they been able to maintain them? Given former Ruskie nuke scientists go for the low, bargain basement price of about $1,000 US/month..I'd say the answer (unfortunately) is YEP.
I don't think they have them.
(I agree that they do exist...you can see that in my post. Just that a major nuclear power would be the ones who could miniaturize them into suitcases.)
My reason: they haven't used them.
I have no doubt they would have been used if they have them. The attack on Iraq would have been the ideal provocation and it didn't produce a nuke attack. This is especially true, if, as we are told that have about 20 or more of these things.
Surely one of them would have been blown to send a message.
They don't have them, in my view.
BUT...if we are ever attacked by nukes, we should respond with nukes. There should be no doubt about that. We should respond whether we're certain who did it or not.