Welcome back.Can't get your medicine over the counter?You might be able to find it online...But lawmakers are trying to tighten regulation for these so called online pharmacies.Andrea Stassou has that story and more in today's health watch report.Drugs that aren't even supposed to be sold over the counter are widely available over the internet.Despite new efforts to regulate on-line pharmacies, a new report's found 85-percent of websites selling highly addictive medications do NOT require a prescription, and it's easy for anyone - even children - to get dangerous drugs with a click of the mouse.A bill aimed at tightening regulation was passed by the Senate in April, but it's still waiting for approval from the House of Representatives.Regular exercise can improve the mental function of dementia patients.Researchers comparing elderly women with varying degrees of dementia found those who got a daily work-out showed a 20-percent improvement in mental ability tests after 6 months.After 12 months, their scores improved by 30-percent.A certain protein in the liver may give doctors a way to predict years in advance who's at high risk for the most common kind of diabetes.Type-2 diabetes is the form closely linked to obesity, but not all obese people develop the condition, and scientists are eager to determine who might be at particular risk.Researchers are already working on a blood test that may be able to isolate the protein to calculate who's at the greatest danger.Those are some of today's top medical stories.I'm Andrea Stassou - CBS News - New York.