Juliani Cardenas, 4, has been missing for over a week now.
Detectives say his mother's ex-boyfriend kidnapped him from the boy's grandmother's house in Patterson.
The investigation will again focus on a canal northwest of town, where search crews believe -- Jose Rodriguez -- may have crashed his car.
So far twelve vehicles have been recovered from the canal but none matching the suspect's.
Rodriguez was last seen driving a silver Toyota Corolla, license plate 6HBW445.
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