Increased security measures are now in place at Sierra Leone's cemeteries.
Transport Minister Simeon Brown said the legislation was flawed and unworkable after police could not find a suitable testing device.
"I ripped open that cavity and found a bag of white powder."
"We think people will be interested because this is one of the most exciting new treatments on the horizon that we've had in a long time."
Their use was above average in all measured regions.
Opioids have the potential of 'epidemic' level addiction as seen in the US, they warn.
It comes as a new report revealed cocaine use in New Zealand has increased by 93 percent in the past year.
"That is a big change in a relatively short space of time."
A New Zealand Navy diver who found the haul described it as "unreal" and "like a movie".