Easiest answer....just check the volume. That day, the stock traded 4X it's avg volume and closed unchanged on the day, even traded down on the day twice. Nobody shorts 800K shares of a .14 stock in one day.
Noboby said insiders were selling. But, again, someone can own up to 6.8 million shares of USPR and not have to report their sales.
4X avg volume, closed even on the day, no follow through in volume following days, stock lower a week later...
Classic pump and dump.
This post is my opinion and should not be used as investment advice.