Should detectives be sniffing out criminals literally? Could their noses be as useful as their eyes in the hunt for clues?
We are looking to determine the potential of perfume to act as a form of trace evidence. But in order to do so, we need to understand how perfume transfer from one piece of fabric to another. Only when we have an understanding of that, we can assign evidential value to that trace evidence.
And what is trace evidence?
So trace evidence is anything that is found at the crime scene in very small amount. It can be anything from dust, to pollen to gunshot residue.
So these are traditionally physical things but you are looking at a scent.
Yes. Yes. We are looking at scent. For example, there’s a lot of studies done on the scent of explosives, of drugs, for example marijuana or cocaine.
Well, you are specifically looking at perfume?
Yes, perfumes are widely used. They are used on a regular basis by both men and women.
We have the analytical technique. And it’s a very accurate and reliable technique. So putting these together, we can obtain a lot of information.
And what types of crimes are we talking about here?
It would have to involve contact.
Human to human?
Yes, it’ll be physical contact that will involve some transfer of fragrance from one piece of fabric to another or to this kin.
So it will be something like sexual assault or for example a pub fight, anything that involves contact.
And what does your research suggest, I mean how accurate can detectives be in tracking down someone from their perfume?
There are many variables that affect the transfer of the perfume, but also the persistence.
I was looking at for how long a perfume stays on a fabric before transferring. So if the offender had perfume on his fabric that was one day old or seven days old, how that influences the transfer onto a secondary piece of fabric.
So how many days potentially would police forces have for this evidence to be credible?
We saw that after seven days, we found 6 perfume components out of the 44 originally identified in a male perfume.
But to be clear, this is not like DNA evidence.
Yes, I think there is a very clear difference between DNA and all other forms of trace evidence and that would include perfume evidence.
And this will just be one bit of evidence. You suspect that this wouldn’t be, you know, the piece of evidence that could be used in court and specifically identify a killer.
1. Sniff out嗅出；发现；寻找
例：A police dog, trained to sniff out explosives, found evidence of a bomb in the apartment.
2. Trace evidence微量迹证; 蛛丝马迹; 微量物证; 痕迹证据; 痕迹物证
例：Forest fire takes on the characteristics of seasonal outbreak, particular occurring place and spreading trace evidence.
3. Assign to 分配给; 指定; 确定; 归因于
例：Type and confirm the password you want to assign to this server's administrator account.
4. On a regular basis 定期地；经常地
例：We're going to be meeting there on a regular basis.
5. Track down追捕
例：I need to track down a vehicle.
我们想确定香水是否能作为一种痕迹证据，为此，需要了解香味从一块布料转移到另一块布料的过程 。只有掌握了这一点，才能给这个痕迹证据添加证据价值 。
对，对，我们研究的是气味 。比方说，关于爆炸物以及大麻和可卡因等毒品的气味有很多研究 。
没错，香水的使用非常普遍 。男性和女性都会经常使用香水 。
我们拥有特定的分析技术，非常准确可靠 。把分析结果汇总起来就能获得很多信息 。