DU may have been used in Fallujah, but since the insurgents had no armour it was unnecessary to use it.
The insurgents used old soviet artillery shells for their explosive content.
The propellant in the shells would contain nitroguanadine to reduce flash and barrel wear.
It is known to be mutagenic.
If the propellant was present with the main charge or discarded widespread contamination is possible.
Who knows?