Who polices public transport troublemakers?
Who exactly is responsible for taking charge when crimes and public order incidents are committed on public transport?
Nobody really unless we expect drivers to double-job as security guards.
It's getting to the point that security is becoming a very real requirement as violence and intimidation are becoming an all to common occurrence on both public and private services.
And it's not simply these acts themselves but the aftermath.
Just last week a three year old child was pricked by syringe as she sat down on a Dublin Bus service. The child's mother said that the needle still had what appeared to be heroin inside and the child had to undergo a plethora of tests to rule out any number of diseases that could have been contracted.
How is any service provider supposed to police this? It's not the fault of the provider or the driver that some careless addict discarded their used needle in a public place, putting others at risk.
A debate about the rights and wrongs of recording public order incidents on public transport was also sparked in recent weeks when a young woman was filmed abusing and threatening a fellow passenger.
Her language and her manner made it clear why someone was filming the entire incident, because she was so menacing they were probably conscious of getting evidence if ever it was needed.
This is the kind of thing that will deter people from taking buses and trains. The worry of encountering one of these delightful passengers is not something anybody wants or needs.
It's enough to struggle on through the morning and evening rush hour and find a seat without having to deal with the threat of violence or verbal abuse.
More often than not, if a passenger is likely to be troublesome, it will be clear from before they even get inside the vehicle.
This is the moment that they should be vetted and refused admission if they are deemed to be acting inappropriately or posing a threat to others.
It might sound extreme but something has to be done to keep troublemakers in line and to protect those who wish to travel safely.
If they don't want to behave properly then they don't deserve to be a passenger. It's as simple as that.