He reached the 400m final at the 2018 European Championships, setting a Portuguese national record of 45.14 in the semifinals.

In August 2022, Dos Santos was accused of failing to stop quickly enough for armed police.

[5] In October 2023, two officers were dismissed as a result of their actions in the 2020 incident because they lied about being able to smell cannabis.

[6][7] The police misconduct panel who considered the 2020 incident deemed Dos Santos to be a 'reasonably credible witness' and also someone who 'did not willingly concede to an alternative viewpoint'.

[7] On 4 October 2024, the Police Appeals Tribunal overturned the gross misconduct outcome and reinstated the jobs of the two officers involved in the incident as well as ordering they receive back pay.