All organisms shed DNA into the environment (eDNA). Research suggests that detecting aquatic invasive species (AIS) early can be better done with eDNA methods than through conventional means [1]. I am testing different ways of eDNA sampling to identify which is most effective for detecting existing invasive mollusks in Lake Tahoe. This approach could then be used by managers to detect new mollusk invaders, including the golden mussel, which is rapidly spreading throughout California [4].