We can't profile, so anyone named Mohammed gets a free pass but we'll test the hell out of baby formula and grandma's medication...
I once flew internationally with my (at the time, years after 9/11) 7 month old kid, the US airports made us jump through hoops and argue about why we should be allowed to take bottles of juice and formula with us which were 2oz in size on a 10hr flight... All the European security types saw that we had a baby, and were cool with everything.
Homeland Security = Huge pain in the ass with pretty much nothing to show for it.