They may not can get help on Saturday.

source: 
Feagin
Entry: 
732
Example: 
They may not can get help on Saturday.
Modal 1: 
may not
Modal 2: 
can
Gender: 
Male
Race/Ethnicity: 
White
Age: 
65
Level of Education: 
Unknown
Home Community, Town, or State: 
AL (Unknown)
Location Collected: 
AL (Unknown)
Year: 
early 1970s
Relation to Addressee: 
acquaintance
Medium: 
Spoken
Sentence Structure: 
1.0
Status: 
Naturalistic