Can illicit video surveillance be used as evidence in a dismissal for misconduct?

On January 7, 2003, Ms. [M] was hired by Pharmacie mahoraise as a cashier.

She was dismissed for serious misconduct by letter dated July 19, 2016 and brought an action before the labour tribunal to contest the dismissal and obtain payment of various sums in severance pay and damages for dismissal without real and serious cause.