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Start by drying off the disposal then fill the sink with water then let it out. Start at the top of disposal and run your hand around the disposal just below where it connects to the sink. If it's dry then move down to the drain connection and run your hand around that/those connection(s). If that's dry too and you have water showing below that then you need a new disposal.
If it's leaking at the sink or the drain then I need to know the brand and model of the disposal or a picture.