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by ChrisBanner 5155 days ago
Often times the prospective company will ask you outright if they can contact your current employer. Companies with a formal application process may prompt you in the documentation they ask you to fill out.

Regardless, there is no harm in saying no. It's the norm for folks that are exploring other opportunities. The only time it may be questionable is if you've already left (or been let go by) your previous employer.