The research on that subject is mixed, to say the least. There just is no conclusive researcher agreement that suggests that general pre-routine stretching prevents injury. The bulk of the research suggests there is no link, or the opposite is true.
Years ago, when I was still coaching HS basketball, I saw UNLV coach Jerry Tarkanian speak at several clinics. He believed that pre-practice stretching increased muscle injury occurance in his players and that a warm-up period of light movement was more effective in reducing injuries: Lay-ins to begin practice, for example. This was when pre-practice stretching had just come into vogue. He was ahead of the research. Tark did believe in post-practice stretching, to some degree.
Interesting short reads abound on the net. Here's a few to peruse.
https://www.ncbi.nlm.nih.gov/pubmed/15233597
https://www.bodybuilding.com/fun/pre-exercise-stretching-and-injuries.htm
http://stretchcoach.com/articles/how-does-stretching-prevent-injury/
http://www.nbcnews.com/id/4619394/ns/health-fitness/t/cdc-stretching-doe...