The only qualification of the exclusive power of Congress in dealing with interstate commerce is imposed by the police power of the several States. By virtue of this power deceptive or dangerous and unhealthful goods may be excluded, but the test of what is deceptive or dangerous and unhealthful does not depend on the opinion of the State Legislature. Thus formerly intoxicating liquors could not be excluded,21 without the consent of Congress;24 oleomargarine, as such, cannot be shut out,25 but artificially colored oleomargarine may be; 26 and a State may limit or prohibit the sale of goods, such as cigarettes (which, though legitimate articles of commerce and not to be classed with diseased meat or decayed fruit, are yet thought by many to be harmful), after they have been taken from the original packages or are no longer in the hands of the original buyer, provided no discrimination is made between goods which are imported and those produced within the State.27 Game laws prohibiting the possession and sale of game at certain seasons including that taken in other States or in foreign countries are also constitutional.28 A State may require a formula to be given by the seller of concentrated food for stock;29 and the use of trading stamps may be regulated.30

20 Western Union Tel Co. v. Attorney General of Massachusetts, 125 U. S. 530, 31 L. Ed. 790, 8 S. Ct. 961; Williams v. Talladega, 226 U. S. 404, 415, 57 L. Ed. 275, 33 S. Ct. 116.

21 Allen v. Pullman's Palace Car Co., 191 U. S. 171, 48 L. Ed. 134, 24 S. Ct. 39; St. Louis Southwestern R. Co. v. Arkansas, 235 U. S. 350, 59 L. Ed. 265, 35 S. Ct. 99; Crew Levick Co. v. Pennsylvania, 245 U. S. 292, 62 L. Ed. 295, 38 S. Ct. 126; International Paper Co. v. Massachusetts, 246 U. S. 135, 62 L. Ed. 624, 38 S. Ct 292.

22 David Lupton's Sons Co. v. Automobile Co., 225 U. S. 489, 56 L. Ed. 1177, 32 S. Ct. 711; Dunlop v. Mercer, 156 Fed. 545, 86 C. C. A. 435.

22aBuck Stove & Range Co. v.

Viokers, 226 U. S. 205, 33 S. Ct 41, 57 L. Ed. 189.

23 Leisy v. Hardin, 135 U. S. 100, 34 L. Ed. 128, 10 S. Ct. 681; Rhodes v. Iowa, 170 U. S. 412, 42 L. Ed. 1088, 18 S. Ct. 664.

24 In 1913, by the Webb-Kenyon Law Congress gave permission to States to prohibit importation of intoxicating liquors; and the validity of this statute has been sustained. Clark Distilling Co. v. Western Maryland Ry. Co., 242 U. S. 311, 61 L. Ed. 326, 37 S. Ct. 180; Seaboard Air line Ry. v. North Carolina, 245 U. S. 298, 62 L. Ed. 299, 38 S. Ct. Rep. 96.

25 Schollenberger v. Pennsylvania, 171U. S. 1, 43 L. Ed. 49,18 S. Ct. 757.

26Plumley v. Massachusetts, 155 U. S. 461, 39 L. Ed. 223,15 S. Ct. 154.