Wow, I would love an aide!
What in particular are you concerned about? Many are
perfectly capable of taking a small group, taking a single
child and teaching him a skill like tying their shoes,
walking them across the campus someplace, supervising
outside the bathroom.
Like teachers, aides should not be in the bathroom with a
child (except perhaps a special ed aide with a special ed
child), alone in a room with a child of the opposite
gender. They should support the teacher they are working
with, not talking smack about them behind their back, and
if something the teacher has done is questionable, they
should politely ask the teacher about it.