The U.S. Supreme Court ruled in 2005, however, that federal authorities could continue under federal law to prosecute California patients and providers engaged in the cultivation and use of marijuana for medical purposes.
A quick guide to using the colon. A colon is made up of two dots, one placed above the other. One common use of the colon is to introduce a list of items. For example: To make the perfect jam sandwich you need three things: some bread, butter and strawberry jam. Three items are listed in the sentence above.
In most cases, we mark the end of a main clause (or sentence) with a period. However, a semicolon may be used instead of a period to separate two main clauses that are closely connected in meaning or that express a clear contrast. Examples:  1 I never vote for anyone; I always vote against..