Here are the 5 stories you need to know this Tuesday morning: an Ontario judge has ruled that a common type of breathalyzer test is inaccurate; Sen. Mike Duffy returned to Parliament Hill on Monday, but refused to answer questions; family members of Canadians with dementia are asking for the feds to reconsider its assisted-dying plan; Donald Trump is looking for a valuable win in the Indiana primary today; and three newly-found planets could be the best spots to look for signs of life.

1. Bad breathalyzer: Thousands of impaired-driving sentences across Canada could be called into question after an Ontario judge found that a common type of breathalyzer test was inaccurate.

2. Duffy returns: Sen. Mike Duffy returned to Parliament Hill on Monday, for the first time following his court battle over claimed expenses. However, he refused to answer any questions including whether he will seek reimbursement for an estimated $250,000 in back pay.

3. Asked to reconsider: Family members of Canadians with dementia are asking the federal government to reconsider its plan for an assisted-dying law that won't allow people to give consent in advance.

4. Looking for a win: Donald Trump is looking for a win in the Indiana primary today, which would vastly increase the likelihood that he would crack the 1,237 delegate mark needed to win the Republican nomination.

5. Possibility of life: Three planets that were discovered recently are thought to be the best places to look for life outside our solar system. Located 40 light-years away, all three are similar, in size and temperature, to Venus and Earth.