Interstingly enough, in the "How to get ready for Pessach without spring
cleaning" pamphlet produced as a result of Rav P. Scheinberg Shlita's shiur,
it says that things dropped on the floor are not chometz and (disregarding the
health issue involved) may be eaten. [ However, many have the custom not to
eat anything after it has fallen on the floor during Passover for fear that
it may have come into contact with a crumb of chametz (unleavened bread)]
Just for the record.