What is the primary purpose of dental impressions in arrests?

The primary purpose of dental impressions in arrests is to gather evidence of identity confirmation. Dental impressions serve as a unique identifier for individuals, as dental patterns and records can vary significantly among people. They can be crucial in situations where other forms of identification are not available or reliable.

In the context of law enforcement, dental impressions can assist in confirming the identity of an arrestee, especially in cases where facial recognition is difficult due to injuries or obscured features. The uniqueness of dental records means they can provide definitive evidence linking an individual to their identity, especially when combined with other forensic evidence.

While the other choices touch on aspects of identification and records, they do not convey the specific evidential purpose that dental impressions serve in confirming an individual's identity during an arrest. The focus on evidence collection for establishing identity makes this the most relevant choice in the context provided.