In Uruguay, it is not possible to sanction or ignore an absence covered by a valid medical certificate solely due to suspicions. The employer must rely on formal controls and possible medical verifications and, only in the event of concrete evidence of irregularity, exercise disciplinary power. If it is possible to prove that the certificate is false or fraudulent, the conduct may constitute serious misconduct, enabling severe disciplinary sanctions, including dismissal, depending on the circumstances of the case and the principle of proportionality.