When California voters broadly legalized marijuana, they were promised that a vast computer platform would closely monitor products moving through the new market. But 16 months after sales kicked in, the system known as track-and-trace isn’t doing much of either.

As of last month, just nine retail outlets were entering data into the network established under an estimated $60 million state contract, even though 627 shops are licensed to sell pot in California.

The rate of participation is similarly slim for other sectors in the emerging industry.

Only 93 of more than 1,000 licensed manufacturing companies producing extracts, oils and other products were documenting their activities in the network in April. And of the nearly 4,000 licensed growers, only about 7 percent, or 254, are using the high-tech system, according to a review of state data