You realize that yellowcake uranium is naturally occurring right?
If you have a 10 by 20 metre lawn, then the top metre of soil will have around 1 kg of uranium in it.
Also if you check into this, you'll quickly find that the uranium a) was not weapons grade and b) was well known to the UN and IAEA and was being stored legally by Saddam's government. It was legally in Iraq according to international law.

