The Supreme Court clarified that the article of the Criminal Code, which deals with illicit drug trafficking (Article 186 KZ-1), states that those who “unjustifiably produce, process, sell or offer for sale or for the purpose of selling or placing in buys, stores or transfers or mediates in the sale or purchase or otherwise unjustifiably places on the market plants or substances classified as illicit drugs or illicit substances in sport, or precursors used in the manufacture of illicit drugs ", and that the word production itself "already includes production, cultivation on a larger scale for resale, because even if we start from the Dictionary of the Slovene Literary Language, the word produce means to produce larger quantities."

[2] In the high-profile case of the murder of Waldorf school principal Elena Begant, he successfully represented husband Alexander Begant, who hit his sleeping wife on the head with an ax eleven times and was sentenced after trial to a lower sentence than agreed at the pre-trial hearing.

[3] Vesenjak also succeeded in the resounding decision of the Supreme Court, in July 2017, that all migrant workers, those who live in Slovenia and work in another country, must be taxed in the same way as others.

[6] Lawyer Vesenjak represents disabled voters in the procedure of a collective lawsuit against the Republic of Slovenia in the amount of EUR 54 million.

[22][23][17] He prepared his dissertation at the UCLA Law School[24] and in 2006 he received the Rector's Award for the best student of the generation.

[27] When the head of the campaign Darko Berlič was convicted for illegal financing of the election campaign of the Maribor mayor Andrej Fištravec,[28] the court did not allow journalist Peter Jančič access to the text of the verdict as public information on the instructions of the Supreme Court.

[30] In legislative and judicial proceedings, he represents migrant workers who are employed in Austria and pay taxes in Slovenia.