All parents must receive the parent notification letter, which informs them about the survey and how to withdraw their child's participation. The Department has several voluntary withdrawal request forms.Dear USCIS Officer: Please accept this request to cancel my current application for F-1 Optional Practical Training. How to find your Opt-Out Window. The educational agency must comply with any parent's request to withhold information. Participants may opt out at any time or reduce or increase the amount of payroll contributions.