We recommend changing the system for checking signature sheets, taking as a basis the norm that the collection of the established number of support signatures should be confirmed either by a random check, or by a complete verification of every collected signature, in case the results of a random check find an excess of invalid signatures. This will allow to avoid situations when, with a high absolute number of signatures submitted for the nomination of a candidate, the commissions refuse to register the candidate, referring to a high percentage of invalid signatures