This article in the Journal of the Royal College of Physicians of Edinburgh presents a balanced account of both sides of the argument with regards to whether screening for dementia might be beneficial, and concerning the recent controversy on the dementia case-finding debate.
Fox, C. Alessi, C. Ahluwalia, S. [and] Hachinski, V. (2014). The use of wide-scale mental agility testing to identify people at risk of dementia. The Journal of the Royal College of Physicians of Edinburgh (JRCPE). 2014. Vol. 44(1), pp.30-35.