Jadeveon Clowney was reportedly arrested last week ... just a couple days before he signed a contract to play for the Dallas Cowboys.
According to police reports, obtained by WSOC-TV, cops confronted Clowney in York County, S.C. on Sept. 12 ... after the star pass rusher allegedly tried to park in a closed lot.
The docs state even though the football player was told he could not park there, he did it anyway -- and he was ultimately arrested on two misdemeanor charges .