Welcome to
BBC Xtra English.
Today Louay and Doug have a story about fighting crime.
Doug's been doing some detective work.
At the scene of a crime, the police often find fingerprints.
These are often used as evidence in criminal cases and to identify the suspect.
Now a group of scientists in the United States say they can get more information from fingerprints than just the identity of the suspect - they can get chemical information.
This is because when you touch something, you leave a fingerprint but you also transfer chemical residues from your skin to the object.
Using a portable device, investigators can determine the health of the person.
They can find out if the suspect has been handling drugs or explosives.
That's forensic science in today's BBC Xtra English.
Are you interested in forensic science? Would you like to be a detective?
هل أنت مهتم بعلم الطب الشرعي؟ هل ترغب في العمل كمحقق بوليسي؟ اكتبوا لنا بالإنجليزية
fighting crime
مكافحة الجريمة
detective work
عمل المحقق البوليسي
fingerprints
بصمات الأصابع
evidence
دليل
criminal cases
قضايا جنائية
the suspect
المشتبه به
chemical information
معلومات كيميائية
chemical residues
آثار مواد كيميائية
portable device
جهاز محمول
forensic science
علم الطب الشرعي
قد نضطر لاختصار مساهماتكم، ونعتذر عن عدم تمكننا من نشر كل ما يصلنا من آراء.
تعليقاتكم يمكن ان تنشر في اي من وسائل الاعلام التابعة للبي بي سي في مختلف انحاء العالم.