International audience; Taken together, these results indicatethat the internal SAM sources createa background that challengesthe analysis of solid samplesin search for organics, creating interferences between terrestrial andpossible indigenous carbon sources. We have been exploring the possibility of SAM-derived C contributions to chlorohydrocarbon generation. Current observations provide no direct link between SAM internal sourcesand the chlorohydrocarbons detected on Mars, thus a martian organic contribution to the chloromethanes, dichloroalkanes and chlorobenzene detected at CBis possible.