| If the fact-finder believes the counterproof offered by the attorney, the witness has been impeached in two ways. |
| Moreover, it is often difficult to tell that a counterproof was taken from a pastel, because to the untutored eye the original pastel's surface remains largely unaffected. |
| The national acceptance of the laws of the Constituent Assembly was the counterproof of its work. |
| Some publications have indicated that no physical machine can be designed to surpass the Turing machines and that it is not possible to construct a counterproof. |
