It comes as figures showed drug-related deaths in Scotland are now 2.5 times that of other UK countries.
The total for 2018 is expected to top 1,000 for the first time.
The Commons Scottish Affairs Committee (SAC) will begin an inquiry on Tuesday to see why the numbers are so high and what the Scottish Parliament can do.
Drug legislation is currently reserved for Westminster.
Read more at: https://www.bbc.com/news/uk-scotland-48150235