It's been some years since I last hiked the Schofield trail. In fact, I'm uncertain if I've hiked it in the current century.
I know I hiked it in the previous century, including one time I, along with others from the Hawaiian Trail and Mountain Club, hiked up the Poamoho trail, crossed along the crest on the Koolau Summit Trail, and descended Schofield. That was in 1999..
A couple decades later, the upper part of the trail is now fenced, as evidenced by the pics below, which were provided courtesy of Patrick Rorie in 2017 via OHE-L mailing list
Regarding the fencing of the Schofield Trail. I'm not sure if I like it or not. As such, I suppose I'm sitting on the proverbial fence regarding the fence. The fencing, by the way, is an initiative of the Koolau Mountains Watershed Partnership, one objective of which is to "protect the watershed against incipient invasive weeds and feral animals" [source].
