Leak in kitchen sink--help!

We have a leak somewhere under our kitchen sink and have been having a devil of a time finding it.
My husband replaced and resealed all of the pipes under the sink, replaced and repaired the gasket for the disposal, and replaced the gasket for the sink drain leading to the disposal, and we're still finding small puddles of water under there.
I know how faucet does leak some when you turn it on. You can see a small bead of water come from the handle. Could that be it?
Any ideas on where we should be looking now? It's driving me crazy!
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