Suicide is only covered under a life insurance policy, if the death happens after the initial policy period. This may range from one to two years after the policy has gone into effect. After this time period, suicide is treated just like any other cause of death.
You will need to verify the initial period policies for suicide and other deaths in your contract when it is purchased. Each insurance company will have their own specific time period that a policy must be in place before it will pay out benefits.