Modern ancient-DNA workflows are designed with contamination control as a central concern.

Work is conducted in dedicated clean rooms that are physically separated from standard molecular biology laboratories where modern human DNA is handled.

Researchers wear full protective equipment.

All surfaces are regularly decontaminated.

Multiple control samples — extractions from blank material that has been processed through the same workflow — are run alongside genuine specimens to detect any contamination introduced by the process itself.

The sequencing of ancient DNA typically uses next-generation sequencing methods that read many short fragments of DNA simultaneously.