The pot pen is six foot tall, six foot wide (barely wide enough), and twenty feet long. With the plastic, you can see there's something growing in there, but you can't tell what. .I use the welded wire fencing that's two inch by four inch galvanized metal. Yes, you could reach a finger through and snag a bud, but that wasn't addressed in the law, just the fact it has to be fenced on five sides and have a locked gate. I used the tiniest little lock I could find. According to the laws as written, the plants can't be seen at ground level from any adjacent property. You can't see my pen unless you are ON my property, but I put the plastic on it just incase a neighbor decided to walk over out back, which has happened because they're perfectly welcome. I've got great neighbors, but they don't need to know everything I'm doing.
My setup passed the HEMP inspection with flying colors! I kept my plants and didn't go to jail, so I must have done something right.
Next year I'm going to take a flat piece of 1" X 10" board and paint my MMJ card number on it large enough that the whirlybirds can read it and stick it on top of a six foot 4X4, aimed at the sky. The wife gets nervous when nine cops and a drug dog show up uninvited......