As many as 30% of posts of jail staff are vacant across India, Union Minister Ajay Kumar Mishra told the Parliament on Wednesday. Jharkhand has the highest number of vacancies, Mishra added in response to BJP member Mahesh Poddar's question. Mishra said jails in almost all states and UTs except Lakshadweep are understaffed. Jails in Daman and Diu are overstaffed.