▁business es ▁are ▁not ▁allowed ▁at ▁rest ▁areas ▁along ▁inter states . ▁However , ▁private ▁business es ▁that ▁began ▁operations ▁before ▁January ▁ 1 , ▁ 1 9 6 0 , ▁were ▁allowed ▁to ▁continue ▁operation ▁in def initely . ▁ ▁Michigan ▁law ▁M CL ▁ 2 8 7 . 1 1 0 1 – 1 1 2 3 ▁forb ade ▁ownership ▁or ▁ac quisition ▁of ▁large ▁and ▁dangerous ▁ex otic ▁car n iv ores ▁as ▁p ets . ▁But ▁animals ▁already ▁owned ▁as ▁p ets ▁at ▁the ▁time ▁of ▁en act ment ▁were ▁grand father ed ▁in , ▁and ▁permitted ▁to ▁be ▁kept . ▁ ▁The ▁F CC ▁stated ▁that , ▁as ▁of ▁March ▁ 1 , ▁ 2 0 0 7 , ▁all ▁televis ions ▁must ▁be ▁equ ipped ▁with ▁digital ▁tun ers , ▁but ▁stores ▁that ▁had ▁TV ▁sets ▁with ▁analog ▁tun ers ▁only ▁could ▁continue ▁to ▁sell ▁analog - t un er ▁TV ▁sets . ▁ ▁In ▁ 1 9 6 7 , ▁the ▁F CC ▁prohib ited ▁companies ▁from ▁ow ning ▁both ▁a ▁radio ▁and ▁a ▁television ▁station ▁in ▁the ▁same ▁market ing ▁area , ▁but ▁those ▁already ▁owned ▁before ▁the ▁r uling ▁were ▁perman ently ▁grand father ed . ▁For ▁example , ▁ABC ▁already ▁owned ▁W ABC - TV , ▁ 7 7 ▁W ABC ▁and ▁W ABC - FM ▁( now ▁W PL J ), ▁and ▁so ▁could ▁continue ▁to ▁own ▁all ▁three ▁stations ▁after ▁the ▁law ▁was ▁passed . ▁But ▁then - current ▁broadcast ing