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It depends on your company policies. If your company policies does not allow you to send free sample then definitely you cannot send. However, If yours is a relatively new company and company policy allows to send free samples then again two cases comes in
Customer: If your customer asks for free sample then definitely you should oblige his request in the light of his past purchases.
Prospects: Fist you need to convert suspect into a prospect, then if you reach an agreement with your prospect regarding price then it would be wise to send samples provided you should confirm his credibility.
