Health Unit Warns Region Following Recent Spike In Overdoses SHARE ON: The Leeds, Grenville and Lanark District Health Unit in Brockville. (Courtney Crowder, mykemptvillenow.com staff) Following a recent spike in overdoses, the local health unit is cautioning the community that it is continuing to grapple with a dangerously toxic drug supply. The spike has occurred over the past couple of weeks in Brockville and Smiths Falls, and was identified through the Overdose Early Warning System that collects overdose information from local hospitals and through an online reporting tool. Jennifer Adams is a Harm-Reduction Coordinator and she says recently the health unit has discovered new batches of fentanyl that has made its way into the community.