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Updated: Jul 19, 2025

Modeling and Simulations of Olfactory Drug Delivery with Passive and Active Controls of Nasally Inhaled Pharmaceutical Aerosols
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Do Saliva-Saturated Spit Hoods Interfere With Ventilation?

Mark W Kroll1, Stacey L Hail2, Michael A Brave3

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Spit hoods allow normal breathing airflow even when saturated with saliva. These findings do not support the hypothesis that saliva-filled spit hoods contribute to death.

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Area of Science:

  • Forensic science
  • Occupational health and safety

Background:

  • Spit hoods are used by law enforcement and medical personnel to prevent pathogen transmission from spitting.
  • No studies previously quantified the time for saliva clearance from spit hoods during normal breathing.

Purpose of the Study:

  • To investigate the airflow and pressure dynamics of saturated spit hoods during simulated normal breathing.
  • To assess whether saliva-filled spit hoods impede airflow sufficiently to pose a risk.

Main Methods:

  • Three popular spit hood models were tested using a pneumatic system simulating quiet breathing (3 mm Hg pressure).
  • Artificial saliva was used to saturate the hoods, and airflow/pressure were measured with digital instruments.
  • Airflow was measured after saliva saturation to determine clearance time.

Main Results:

  • All tested spit hoods cleared sufficient saliva within 5 seconds to allow airflow of 1 m/s.
  • This airflow exceeds that of an N95 mask under similar pressure conditions.
  • Spit hoods demonstrated very low breathing resistance even when saturated.

Conclusions:

  • Commonly used spit hoods permit adequate airflow for normal breathing after saturation.
  • The results do not support the theory that spit hoods contribute to death due to airway obstruction by saliva.