Are you sure? It is not the case unless that offense is classified as Felony for Immigration Purposes. FYI.
Yes, I am sure. You can read the relevant portion of 8CFR 12.II.IV.1227(a)(2) and judge for yourself:
http://www.law.cornell.edu/uscode/8/usc_sec_08_00001227----000-.html
There are several sections there that make an alien deportable regardless of how exactly (misdemeanor or felony) the convictions in question are
classified.
For example, this applies to multiple criminal convictions for CMIT:
"(ii) Multiple criminal convictions Any alien who at any time after admission is convicted of two or more crimes involving moral turpitude, not arising out of a single scheme of criminal misconduct, regardless of whether confined therefor and regardless of whether the convictions were in a single trial, is deportable. "
What matters for this section is if the crimes in question involve moral turpitude and that there are more than one such convictions; the classification (misdemeanor or felony) is irrelevant for this provision. Thus if someone has two misdemeanor convictions for CIMTs is deportable (provided the crimes in question did not arise out of a single scheme of criminal misconduct).
The preceding provision similarly makes no distinction between misdemeanor and felony convictions:
"(i) Crimes of moral turpitude Any alien who—
(I) is convicted of a crime involving moral turpitude committed within five years (or 10 years in the case of an alien provided lawful permanent resident status under section 1255 (j) of this title) after the date of admission, and
(II) is convicted of a crime for which a sentence of one year or longer may be imposed,
is deportable. "
The primary qualifier in (II) is what the maximum possible penalty for a particular crime is, not whether it is classified as a felony or a misdemeanor.
Similarly, the provision regarding drug-related offenses makes no distinction between felony or a misdemeanor convictions:
"(B) Controlled substances
(i) Conviction Any alien who at any time after admission has been convicted of a violation of (or a conspiracy or attempt to violate) any law or regulation of a State, the United States, or a foreign country relating to a controlled substance (as defined in section 802 of title 21), other than a single offense involving possession for one’s own use of 30 grams or less of marijuana, is deportable. "
The same is true for the section dealing with crimes of domestic violence.