. S . ▁ 3 1 7 ▁( 1 9 2 5 ), ▁was ▁a ▁decision ▁by ▁the ▁United ▁States ▁Supreme ▁Court , ▁which ▁held ▁that ▁the ▁state ▁stat ute ▁under ▁which ▁the ▁Maryland ▁Public ▁Service ▁Commission ▁( PS C ) ▁issued ▁certific ates ▁of ▁public ▁convenience ▁and ▁necessity ▁to ▁common ▁carri ers ▁engaged ▁in ▁inter state ▁commerce ▁viol ated ▁the ▁Com merce ▁Cla use ▁of ▁the ▁United ▁States ▁Constitution . ▁ ▁Background ▁The ▁Maryland ▁General ▁Assembly ▁in ▁ 1 9 2 2 ▁am ended ▁the ▁P SC ▁stat utes ▁to ▁require ▁common ▁carri ers ▁to ▁obtain ▁a ▁certificate ▁from ▁the ▁P SC ▁based ▁upon ▁whether ▁the ▁proposed ▁motor ▁car rier ▁service ▁was ▁" good ▁for ▁the ▁public ▁convenience ▁and ▁necessity ." ▁George ▁W . ▁Bush ▁& ▁S ons , ▁which ▁operated ▁a ▁tr uck ▁line ▁between ▁Del aware ▁and ▁cities ▁in ▁eastern ▁Maryland , ▁was ▁directed ▁by ▁the ▁P SC ▁to ▁apply ▁for ▁a ▁certificate . ▁After ▁a ▁hearing , ▁the ▁P SC ▁denied ▁the ▁application . ▁The ▁company ▁then ▁appe aled ▁to ▁the ▁state ▁courts ▁up ▁through ▁the ▁Maryland ▁Court ▁of ▁App e als , ▁arg uing ▁that ▁the ▁state ▁stat ute ▁viol ated ▁the ▁Com merce ▁Cla use ▁by ▁attempting ▁to ▁reg ulate ▁inter state ▁commerce , ▁but ▁the ▁state ▁courts ▁u ph eld ▁the ▁den ial ▁of ▁the ▁certificate ▁by ▁the ▁P SC . ▁ ▁The ▁company ' s ▁name ▁is ▁a ▁coinc idence ; ▁it ▁has ▁no ▁connection ▁to ▁later ▁U . S . ▁President ▁George ▁W .