In researching my father I found a 1930 Mexico census on Family search with my grandmother as head of household but the residence is "Carcel Municipal de Guanajuato" I have pasted part of the information below. My question what does this mean? and is there somewhere to find arrest/jail archives? I am having a hard time finding birth record for both of my paternal grandparents :( so any help would be appreciated. Thanks!
Head of Household: 	Maria Luz Hdes
Residence: 	Carcel Municipal, Irapuato, Guanajuato, Mexico
Birthplace: 	Guanajuato
Marital Status (Spanish):
Film Number: 	1464248
Digital Folder Number: 	4107113
Image Number: 	00078
Page Number: 	21
Line Number: 	
 	Household	Gender	Age
  	Santos Zavala 	M 	6a
	Salvador Zavala 	M 	1a
