Risk and harm reduction Vol. 23, 2017/2 - pagesPages 5 to 6Risk and harm reduction By Marc Valleur, Aurélie WellensteinPages 7 to 8Tribute to Jean-Pierre Lhomme Pages 9 to 33What is a psychologist at a CAARUD? Elements of theoretical reflections based on professional experience at the CAARUD in Saint-DenisBy Emma RichaudPages 35 to 56Substance psychoactive use in prison: a retrospective qualitative studyBy Patrice Fernandes Pereira, Catherine SimonPages 57 to 72From community-based research to social transformation: the example of the ANRS-AERLI project on injecting risk education and supportBy Perrine Roux, Marie Debrus, Daniela Rojas Castro, Fred Bladou, Marie Suzan-Monti, Elisabeth Avril, P. CarrieriPages 73 to 85Multi-centre evaluation of syringe exchange programmes in pharmacyBy Emilie Beauvillier, Nicolas Bonnet, Anne-Cécile CornibertPages 87 to 109Acceptability and techniques of appropriation employed by users of tools aimed at the reduction of the risks linked to injection – evaluation of the Steribox®By Marie Jauffret-RoustidePages 111 to 126Cannabis neurotoxicity: analysis of structural neuroimaging dataBy Daniele Zullino, Gerard Calzada, Julie Gaspoz, Sophia Achab, Gabriel Thorens