"sufficient training on these matters" would certainly be if possible identify the offender.
Pass that information onto ATC!
The offenders ID would be checked against data bases, any red flags you would "assume" would be followed up.
I expect that would include but not be limited to.
Police
Mental institution
Doctor treating this person
Department of Immigration and Boarder Protection (Student Visa)
Education Provider
Teachers from Education Provider
Malaysian Airlines
Travel agent if used.
Not a five minute job.
Also all on-board need to be detained until cleared - this alone can be difficult, directing a large crowd to a secure holding area that would be quite excited after the event.