From Sept 2007 DNR Fishing Page:
The Natural Resources Police has brought it to our attention that the “Spot Traps” that are being sold in the Ocean City area are illegal under Maryland law. Most of the spot traps being marketed are roughly 24”x10”x10”. The Natural Resources Police has brought it to our attention that the “Spot Traps” being sold in the Ocean City area are illegal under Maryland law. Most of the spot traps being marketed are roughly 24”x10”x10”. Minnow traps that may be legally set by recreational fishermen are defined by regulation as having no dimension greater than 18 inches in any direction and an internal volume not greater than 1730 cubic inches. The 24” spot trap, and some of the other sizes of spot traps, exceeds these maximums. Also, the entrance funnel or funnels openings cannot exceed 2 inches in diameter.