There are about 7,000 missing people in Canada at any given time. Of those perhaps a sixth of the adults have mental or drug issues -- the rest are missing due to other causes.
Sometimes these are benign -- people who leave and seek a new start -- others quite the contrary -- murder victims whose bodies are not found. Most are people involved in accidents or arrested or for some other reason kept out of reach of their family for a brief period.
Regardless, missing people cause enormous heartache and anxiety -- the lack of information can devastate families.
Perhaps the only good news is that virtually all missing persons cases are resolved -- US statistics suggest about 1/3 of a percent of cases are unresolved after a year. So 99.6% of cases are resolved fairly quickly.