As for instruction in French as a second language in the public schools, many of those teachers have been trained to teach French as a first language. They have an additional qualification to teach French as a second language. I believe this situation is the same as in any system. Perhaps some teachers need more training and experience.
However, based on the information I have, many of those teachers are highly qualified. They are very good, very suitable and very effective. However, it is possible that some teachers need additional assistance. You see that in any system.