Aluminum, a non-ferrous metal, is indeed detectable by metal detectors. This capability is due to the metal's conductive properties, which allow it to react to the electromagnetic field generated by the detector. The detection process, however, can be influenced by various factors such as the size, shape, and type of the aluminum object, as well as the settings and capabilities of the metal detector itself. Advanced detectors with discrimination features can differentiate between aluminum and other metals, enhancing the efficiency of the search. While aluminum foil, for instance, might be detected, it can sometimes lead to false signals due to its thinness and widespread presence in trash. Therefore, while metal detectors can find aluminum, the success of detection largely depends on the specific circumstances and the technology used in the detector.