Article 26. § 1. Whoever acts with the purpose of averting an immediate danger threatening any interest protected by law, if the danger cannot otherwise be avoided but the interest sacrificed has a lower value than that of the interest rescued, he shall be deemed to have not committed an offence. § 2. Whoever rescues any interest protected by law under the circumstances defined in § 1, or sacrifices an interest which does not represent a value manifestly greater than the interest being rescued, he shall also be deemed to have not committed an offence. § 3. In the event that the limits of necessary defence have been exceeded, the court may apply an extraordinary mitigation of the penalty or even renounce its imposition. § 4. The provisions of § 2 shall not be applied when the perpetrator sacrifices an interest which he has a special duty to protect even by exposing himself to personal danger. § 5. The provisions of § 1 through 3 shall be applied accordingly when only one of the obligations borne by the perpetrator can be fulfilled. Article 27. § 1. Whoever acts with the purpose of conducting a cognitive, medical, technical or economic experiment, shall not commit an offence when the expected benefit is of an essential cognitive, medical or economic importance, and the expectation of these benefits, their purposefulness and the way of conducting the experiment are justified according to the present state of knowledge. § 2. An experiment is inadmissible without the consent of a participant subject thereto, duly informed of the expected benefits and the danger of adverse effects and of the probability of their occurrence, as well as of the possibility of withdrawing one's participation in the experiments at any stage thereof. § 3. The principles and conditions for admitting experiments shall be provided for in law. Article 28. § 1. Whoever commits an act while being in error as to a circumstance constituting a feature of an prohibited act, shall not intentionally commit an offence. § 2. Whoever commits an offence in the justified but mistaken conviction that a circumstance has 9