There is as yet insufficient evidence to conclusively confirm or deny this hypothesis. Her possible survival has been conclusively disproved. Some scholars maintain the evidence is insufficient to prove Jefferson's paternity conclusively. These hypotheses, however, have been conclusively refuted. Both of these notions have been conclusively refuted. The doubts lasted until 1940, when in similar experiments Abraham's theory was conclusively disproved. Finding or conducting research that conclusively proves that portrayal is somewhat difficult. This in itself, however, is not enough to prove Etruscan origin conclusively. This theory was conclusively disproven in 1999. However this possibility has not been conclusively proven. However, Morgan's methodical destruction of evidence keeps Luther from conclusively proving her guilt. However, theoretically speaking, there is nothing to conclusively indicate that intergalactic travel is impossible. Experiments attempting to conclusively demonstrate this effect have been conducted since the 1990s. Investigations proved conclusively Hal had not left Ohio during that period. Kurzweil believes there is "no objective test that can conclusively determine" the presence of consciousness.