Is 2ml 'shareable'?

In practice the practical difficulty of getting every last drop out of a glass ampoule, and the fact the most people use around 1ml, often slightly more, means that although sharing is sometimes theoretically possible, in practice it is rare.

People who might share water from an amp would be more likely to share water from other sources that would be both easier to share and contaminated with more blood from more people.

The fact that it’s given out by a needle exchange in the context of single-use equipment and the advice and information means that the 2ml ampoule has significant potential to reduce sharing of water, and therefore to reduce hepatitis C transmission.

There is a clear reminder not to share on every 'safe snap' label.