Does your license have a bar code?

I would call Target's main office and ask for an explanation, further. Ask to speak to a manager at customer relations.

I would wonder how it scans, if there is no bar code?

Some major companies, have rules that cover ALL states.
For example another state may have a rule, about this, so Target uses that as a base to require at all point of sale locations in all states.
The strictest applies to all in other words. Many chains do this, because the programming is central.

I would tell the customer representative that you will no longer shop at Target. I would do that myself.

I have noticed myself a movement for cough syrups containing DM. SAMs club asked for my ID at check out for Tussin DM.
Times are changing as young people abuse more and more health products.