22 ESSENTIALS OF VETERINARY LAW 
nation has frequently obtained the same result by 
the use of other powers, or through moral in- 
fluence. For example: Though Congress may not 
have the power to determine the conditions under 
which veterinarians shall be permitted to practice 
their profession in the several states, the object 
may be obtained indirectly. Under the provision 
giving to Congress exclusive control over inter- 
state and foreign commerce, laws have been passed 
giving to the Department of Agriculture the 
supervision of the meat industry and the trans- 
portation of animals. It is necessary for the 
Department to employ many veterinarians, and 
it may refuse to consider the application of 
candidates who have not graduated from colleges 
of a certain prescribed standard. This forces all 
the colleges to that standard. Further, the Depart- 
ment may refuse, under suitable laws, to permit 
live stock to pass from one state to another unless 
accompanied by a certificate from a veterinarian 
of approved standing. Neither of these provisions 
would have influence upon the right of a man to 
practice his profession in a given state, except 
indirectly. This right of regulation, depending 
as it does upon police power, has always been 
interpreted as belonging to the individual states. 
For this reason there would be great difficulty in 
arranging for such a license as would be operable 
in all the states. The number of fully qualified 
veterinarians is not relatively great. Most of the 
present practitioners might not find it difficult to 
pass the test which might be required of them 
should they attempt to move into another state. 
There is in this condition a practical guaranty 
