its actually 28.3495, but i believe in the legislation, it is stated as 28 grams.
also, there are extenuating circumstances that make the amount irrelevant, such as being accompanied by a scale, money or having the marijuana in separate baggies.
11357. (a) Except as authorized by law, every person who possesses
any concentrated cannabis shall be punished by imprisonment in the
county jail for a period of not more than one year or by a fine of
not more than five hundred dollars ($500), or by both such fine and
imprisonment, or shall be punished by imprisonment pursuant to
subdivision (h) of Section 1170 of the Penal Code.
(b) Except as authorized by law,
every person who possesses not
more than 28.5 grams of marijuana, other than concentrated cannabis,
is guilty of an infraction punishable by a fine of not more than one
hundred dollars ($100).
(c) Except as authorized by law,
every person who possesses more
than 28.5 grams of marijuana, other than concentrated cannabis, shall
be punished by imprisonment in a county jail for a period of not
more than six months or by a fine of not more than five hundred
dollars ($500), or by both such fine and imprisonment.
Possessing marijuana for sale is a different crime than possessing over one ounce of marijuana. Possessing marijuana for sale is covered under 11359 H&S. This can be met by weight alone, or by the accompaniment of scales, individual packing, cash, pay/owe sheets, etc...
Source: 4 years of LE in Mendocino County