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              <p>In the context of a general continuous financial market model, we study whether the additional information associated with an honest time tau gives rise to arbitrage profits. By relying on the theory of progressive enlargement of filtrations, we explicitly show that no kind of arbitrage profit can ever be realised strictly before tau, whereas classical arbitrage opportunities can be realised exactly at tau as well as after tau. Moreover, arbitrages of the first kind can only be obtained by starting to trade as soon as tau occurs. We carefully study the behavior of local martingale deflators and consider no-arbitrage-type conditions weaker than no free lunch with vanishing risk.</p>
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