Answer:
Because the federal government has only those powers granted to it by the Constitution.
Explanation:
The constitution is the body of documents where the functions and limits of the tiers and arms of government are spelled for regulation. Hence, all legislation of the government must conform with the constitutional authority for passing.
First lets start with physical appearance which would include of course age and the sex of a person. Also the the facial features and skin are important in describing an individual as well as level of consciousness.
Significant information for body structure would include body build as well as contour and stature. Symmetry and position and as well as nutrition likewise provide significant information.
Mobility usually refers to range of motions person exhibits and their gait, which provides information how person walks, runs and does other such activities.
Behavior has many significant information such as facial expressions and mood and affect. These can be a seen also as a part of nonverbal communication and thus provide a wealth of information. Speech also contains many information as well as how someone dresses. Personal hygiene is also a factor here.