Injections
The Alchemist has developed a technique allowing them to change the target of their extracts from self to touch.  They do this by placing the extract into an injecting device and placing it against an unarmored area of the target.  Doing this provokes an attack of opportunity.  Using this ability against a willing target does not require a check, but using it against an unwilling target requires a touch attack.  If the extract does not have a saving throw listed a fortitude save is allowed for unwilling targets.  An alchemist can have one extract in an injector at a time.  An injector cannot be used by another character even if the alchemist possesses the infusion discovery.