What are the challenges of collecting and using eyewitness evidence in criminal investigations

What are the challenges of collecting and using eyewitness evidence in criminal investigations?
investigating crime; criminological perspectives.
this paper should consist of 200 words and a references bibliography in harvard style by the end. please use academic sources and use simple english words.
this links are useful.
http://www.cps.gov.uk/legal/h_to_k/identification_of_suspects/index.html
http://www.cps.gov.uk/legal/a_to_c/confession_and_breaches_of_police_and_criminal_evidence_act/index.html

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