By Imran Rahman-Jones and Lindsay Brown
Recent stories of women being spiked by injection on nights out have caused worry among students and politicians.
Several UK police forces are investigating possible cases, and the home secretary has asked for an urgent update on the scale of the problem.
Experts say it’s unlikely to be happening on a wide scale, and that drink spiking is a more pressing issue.
Medics we’ve spoken to are divided on how easy it would be to inject someone with drugs without them noticing.