Canons of Statutory Construction
Canons give common sense guidance to courts in interpreting the meaning of statutes. Most canons emerge from the common law process through the choices of
judges. Proponents of the use of canons argue that the canons
constrain judges and limit the ability of the courts to legislate from the bench. Critics argue that a judge always has a choice between competing canons
that lead to different results, so judicial discretion is only hidden through the use of canons, not
reduced.
Textual
Textual canons are rules of thumb for understanding the words of the text. Some of the canons are still known by their traditional Latin
names.
Plain meaning
When writing statutes, the legislature intends to use ordinary English words in their ordinary
senses. The United States Supreme Court discussed the plain
meaning rule in Caminetti v. United States, 242 U.S. 470 (1917), reasoning "[i]t is elementary that
the meaning of a statute must, in the first instance, be sought in the language in which the act is framed,
and if that is plain... the sole function of the courts is to enforce it according to its terms." And if a
statute's language is plain and clear, the Court further warned that "the duty of interpretation does not
arise, and the rules which are to aid doubtful meanings need no discussion."
Ejusdem generis("of the same kinds, class, or nature")
When a list of two or more specific descriptors is followed by more general descriptors, the
otherwise wide meaning of the general descriptors must be restricted to the same class, if any, of the
specific words that precede them. For example, where "cars,
motor bikes, motor powered vehicles" are mentioned, the word "vehicles" would be interpreted in a limited
sense (therefore vehicles cannot be interpreted as including airplanes).
Expressio unius est exclusio alterius("the express mention of one thing excludes all others")
Items not on the list are assumed not to be covered by the statute. However, sometimes a list in a statute is illustrative, not
exclusionary. This is usually indicated by a word such as
"includes" or "such as".
In pari materia("upon the same matter or subject")
When a statute is ambiguous, its meaning may be determined in light of other statutes on the same
subject matter.
Noscitur a sociis("a word is known by the company it keeps")
When a word is ambiguous, its meaning may be determined by reference to the rest of the
statute.
Reddendo singula singulis("refers only to the last")
When a list of words has a modifying phrase at the end, the phrase refers only to the last, e.g.,
firemen, policemen, and doctors in a hospital.
Generalia specialibus non derogant("the general does not detract from the specific")
Described in The Vera Cruz (1884) 10 App. Cas.
59 as: "Now if anything be certain it is this, that where there are general words in a later Act capable of
reasonable and sensible application without extending them to subjects specially dealt with by earlier
legislation, you are not to hold that earlier legislation indirectly repealed, altered, or derogated from
merely by force of such general words, without any evidence of a particular intention to do so." This means
that if a later law and an earlier law are potentially—but not necessarily—in conflict, courts will adopt the
reading that does not result in an implied repeal of the earlier statute. Lawmaking bodies usually need to be explicit if they intend to repeal an
earlier law.
Substantive
Substantive canons instruct the court to favor interpretations that promote certain values or
policy results.
"Charming Betsy" Canon
National statute must be construed so as not to conflict with international law. See Murray v. The Charming
Betsy, 6 U.S. (2 Cranch) 64 (1804): "It has also been observed that an act of Congress ought never to be construed to violate
the law of nations if any other possible construction remains..."
Interpretation in Light of Fundamental Values
Statute does not violate fundamental societal values.
See, for example, Holy Trinity Church v. United States, 143 U.S. 457 (1892).
Rule of Lenity
In construing an ambiguous criminal statute, the court should resolve the ambiguity in favor of the
defendant. See McNally v. United States, 483 U.S. 350
(1987); See, e.g., Muscarello v. U.S., 524 U.S. 125 (1998) (declining to apply the rule of lenity); Evans v.
U.S., 504 U.S. 255 (1992) (Thomas, J., dissenting); Scarborough v. U.S., 431 U.S. 563 (1977) (Stewart, J.,
dissenting); See United States v. Santos (2008).
Avoidance of abrogation of state sovereignty
See Gregory v. Ashcroft, 501 U.S. 452 (1991); see also Gonzales v. Oregon, 546 U.S. 243 (2006); see
also Nevada Dept. of Human Resources v. Hibbs, 538 U.S. 721 (2003)
"Indian" Canon
National statute must be construed in favor of Native Americans. See Chicksaw Nation v. United States, 534 U.S. 84 (2001): "statutes
are to be construed liberally in favor of Indians with ambiguous provisions interpreted to their
benefit."
Deference
Deference canons instruct the court to defer to the interpretation of another institution, such as
an administrative agency or Congress. These canons reflect an
understanding that the judiciary is not the only branch of government entrusted with constitutional
responsibility.
Deference to Administrative Interpretations (US Chevron
deference)
If a statute administered by an agency is ambiguous with respect to the specific issue, the courts
will defer to the agency's reasonable interpretation of the statute. This rule of deference was formulated in the US by the United States
Supreme Court in Chevron v. Natural Resources Defense Council, 467 U.S. 837 (1984).
Avoidance Canon (Canon of Constitutional Avoidance)
If a statute is susceptible to more than one reasonable construction, courts should choose an
interpretation that avoids raising constitutional problems. In
the US, this canon has grown stronger in recent history. The
traditional avoidance canon required the court to choose a different interpretation only when one
interpretation was actually unconstitutional. The modern
avoidance canon tells the court to choose a different interpretation when another interpretation merely
raises constitutional doubts.
Avoiding Absurdity
The legislature did not intend an absurd or manifestly unjust result.
Clear statement rule
When a statute may be interpreted to abridge long-held rights of individuals or states, or make a
large policy change, courts will not interpret the statute to make the change unless the legislature clearly
stated it. This rule is based on the assumption that the
legislature would not make major changes in a vague or unclear way, and to ensure that voters are able to
hold the appropriate legislators responsible for the modification.
Leges posteriores priores contrarias abrogant(Subsequent laws repeal those before enacted to the contrary, aka "Last in
Time")
When two statutes conflict, the one enacted last prevails.
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