There is a slot limit this Spring season, meaning that one fish in the slot between 28 inches to 36 inches can be kept, or one fish over 40 inches. So, you CANNOT keep a fish between 36 and 40 inches.
2015 Potomac Rockfish Limits:
Striped Bass (Rockfish) SPRING Season 2015
Season Open: April 18 through May 15
Open Area: Below Harry W. Nice Bridge (Rt. 301)
Minimum / Slot Limit: 28" to 36" -OR- 1 fish over 40"
Possession Limit: One (1) per person (including charter captain)
Bait Restrictions: No Live Eel, No more than two (2) hooks
Striped Bass (Rockfish) SUMMER/FALL Season 2015
Season Open: May 16 through December 31
Open Area: Below Woodrow Wilson Bridge (I-95)
Minimum / Slot Limit: 20" with only one (1) over 28"
Possession Limit: Two (2) per person
Bait Restrictions: No more than two (2) hooks
Here's a screenshot of the actual
PRFC regulation card for 2015.