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Cigarettes Do Start Fires

October 01 2013

Forensic Science Interpreting The Evidence

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Fire Investigation

Cases where smoking/accidental discard has been raised as a defence are sometimes dismissed on the basis that the timeframe was too long or too short for a fire to occur.  In a recent Crown Court trial, a forensic scientist specialising in fire cases told a jury that it takes more than 30 minutes for a lit cigarette (placed in suitable fuels) to turn into flames, and with a hand-rolled cigarette suggested that it was not possible.  This opinion is not uncommon, but not necessarily correct.  

In recent tests conducted by KBC, a commercial cigarette was positioned within shredded paper and tissue in a waste paper bin and placed outside where a light breeze was blowing.  Flames were seen in just over 5 minutes.   

We found hand-rolled cigarettes tended to go out within a few minutes without causing a fire, however a fire investigator in the US has reported that, during tests done on a very windy day, even a hand-rolled cigarette could lead to flames in the same timeframe. 

The amount of ventilation can radically change the propensity and time it takes for a cigarette to set fire to things like paper, cotton, cardboard or sawdust; consequently this must be a factor taken into consideration when ruling in or out possible causes.

Author

David Schudel

Dr David Schudel
BSc(Hons), PhD, CChem, MRSC, CFI

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