By Tony Owusu Constellation’s $4 billion investment in Canopy Growth hasn’t had the positive impact the company hoped for. It’s been over four years since beer and spirits maker Constellation Brands (STZ) – Get Constellation Brands Inc. Report announced that it would invest $4 billion in Canadian cannabis company Canopy Growth (CGC) – Get Canopy Growth Corporation Report. The move made Canopy Constellation a global cannabis partner. Rob Sands, CEO of Constellation at the time, called the cannabis industry “a tremendous growth opportunity.” What a difference a few years can make now that the Ca…