Motion to Suppress

Hi all!! Currently a clerk at the PD's office, and got assigned my first motion to suppress evidence. My supervisor said that there is no hope to get anything suppressed, so there is not much pressure on my performance. However, how do you draft a motion when the facts of the case clearly do not support it? I feel like there are not any valid factual arguments I can make - any advice for now and for future on best routes to take when you feel stuck like this?