A/HRC/4/36 page 23 − End forced evictions; − Conduct impartial and credible investigations into grave violations of human rights, past and present. Bring to justice those responsible. The murder of trade union leader, Chea Vichea, is a case in point; − Establish an independent commission to investigate complaints concerning military or police conduct; − End forced confessions as evidence in trials. Institute a system of regular visits of NGOs to police cells and detention centres to prevent torture and cruel, inhuman and degrading treatment or punishment. Complete ratification of the Optional Protocol to the Convention against Torture and implement its provisions; − Review sentencing policies. Introduce non-custodial options as an alternative to imprisonment, first and foremost for children; − Ensure that lawyers, family members and human rights organizations have regular access to prisoners and detainees. Access to land and livelihoods − Make publicly available details of all approved concessions, including contracts, maps and information about concession companies and their shareholders; − Enforce the requirement to undertake public consultations and meaningful environmental social impact assessments prior to granting economic land concessions. Concessions granted without these requirements being fulfilled should be null and void; − Cancel concessions that do not comply with the requirements of the Land Law and its sub-decrees. Provide a mechanism for affected communities to request the review and cancellation of non-compliant concessions; − Ban the granting of economic land concessions and other concessions in areas of primary forest; − Ban the sale of land and the granting of economic land and other concessions in areas occupied by indigenous communities, pending the registration of indigenous claims over traditional lands and the collective titling process; − Put in place mechanisms to protect indigenous land pending the registration of collective title, and finalize the process of registration of collective title over indigenous land;