Initiation Stories: An Examination of the Narratives of People Who Assist With a First Injection.

Background: Research in the area of initiation to injection drug use that focuses on the perspective of initiators, or those who help with a first injection, is rare.

Objective: To explore the process of initiation to injection drug use from the point of view of initiators.

Methods: Semi-structured, in-depth qualitative interviews were conducted at a harm reduction program in Toronto, Canada.

Interrupting the social processes linked with initiation of injection drug use: results from a pilot study.

Background: Injection drug use is a skill learned in social settings. Change the Cycle (CTC), a peer-delivered, one-session intervention, is designed to reduce among people who inject drugs (PIDs) injection initiation-related behaviours (i.e.

Determining a quantum state by means of a single apparatus.

The unknown state rho of a quantum system S is determined by letting it interact with an auxiliary system A, the initial state of which is known. A one-to-one mapping can thus be realized between the density matrix rho and the probabilities of the occurrence of the eigenvalues of a single and factorized observable of S+A, so that rho can be determined by repeated measurements using a single apparatus. If S and A are spins, it suffices to measure simultaneously their z components after a controlled interaction.