well recently 61 flight schools and barely new 141 flight schools that they dont have the eligibility to train international students,...are tryin to bring students on somebodies else visa....which is called ILLEGAL pilot training and vulnerable for that school to close permanetly ....
the most secure way for you to know that the school is legite....is have a school that is accredited ....which means that been in business along time and they are regulated by a regulatory body...and it will insure you that they are legitie ....quality...and reputable school....
just beware of schools that have fleets in their website and on ground they have 4 or 5 aircrafts
good luck