If CPS is called because there is suspicious activity or the belief that abuse or neglect is occurring, you still have rights as a parent.
Basic rights include:
If your child is removed from your custody during the investigation, you have a right to request your child to be placed in the care of a relative or family friend.
You can appeal the CPS decision and in some cases create a family service plan in order to regain custody of your child or children.
Remember, CPS is not an arresting authority; they just have the ability to seek legal action so long as merit exists.