The ruling on whoever doubts concerning the Stones falling into the Basin (at the foot of the Pillars)
What is the ruling on whoever has a doubt that some of his stones did not fall into the basin?
Whoever has doubt, then he must complete it. He should take some stones from the ground from where he is in Mina and complete the stoning with them.
Shaykh `Abdul-`Azeez Bin Baz
Fatawa Islamiyah Darussalam Vol:4 no.249